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The children now have sources of food and water, but the three-hour round trip to the lake takes up too much time and energy every day, and their only means of carrying water are the plastic bottles from the shuttle's emergency rations, which don't hold much water. Bell and Shingo come up with the idea of digging a pit and filling it with water, using their deflated life raft - which washed up on the beach during the night - to hold and carry the water. After digging the pit, the children head towards the lake, on the way encountering the small kangaroo-like creature from earlier. Sharla finds it cute, and calls it a tobihane, from the verb meaning "to hop" (飛び跳ねる, tobihaneru), but she is horrified when the others want to catch it for food. They reach the lake, which Sharla names "Fairy Lake", and stop to rest. When Howard pushes Luna into the lake, she suddenly feels a strange sensation, and is briefly surrounded by a pink glow. After they find fruit on the trees and fish in the lake, Shingo suggests the idea of building a house in the big tree, which Sharla names "Magnificent Tree" (大いなる木, Ooinaru Ki). As the children inspect the tree, Menori realizes that the footprints left by the elephantine creature they'd encountered earlier were the same as the footprints left in the shuttle's hull after their first night on land. They decide the area around the tree is simply too dangerous, and head back to the beach with the raft filled with water. On the way back, Shingo slips and accidentally spills some water, and Menori's overly strict admonishment is questioned by Luna.

In the destroyed shuttle, Menori finds her violin undamaged in one of the storage lockers. Luna sees the large creature's footprints leading away. Bell manages to re-start the fire from the remaining embers, and the children spend the night in a nearby cave. Luna decides that their only remaining option is to build a house in the Magnificent Tree after all. She comes up with the idea of using the shuttle's broken-off wings for the house's foundation and floor, but Menori quickly points out that the wings simply too heavy for them to move. However, Shingo comes up with ideas for some of the smaller components, such as making pulleys, or using a porthole for a window. The children return to the lake and start to search for more building materials and food, but while Luna is tying a pulley to a branch the huge creature returns, in a frenzy. Luna falls onto its back, and it runs into the lake. Suddenly, she starts to glow pink, and sees the creature's memory of Howard's Magnificent Tree branch, which he'd brought back to the shuttle the previous day, lying in the shuttle's open hatchway. She realizes the creature had been injured trying to reach the branch, and finds a piece of the shuttle sticking out of the side of its neck - when she pulls it out, the creature calms and starts to eat leaves. However, Howard, returning with fish, sees it and screams in terror, which frightens the creature away.

The children, with Pague's help, rip some of the remaining bulkhead panels off the shuttle to use on the house, while Menori stands to one side directing their efforts. As they start to lift the panels onto a cart for Pague to haul to Fairy Lake, Howard protests that Menori is standing doing nothing. Luna asks Menori to pitch in, but on helping to lift the first panel, she cuts her finger. As she spaces out, Bell fashions a bandage from a strip of Sharla's handkerchief. She has a flashback to a memory of her mother taking away her pain when she injured her finger as a child, then a memory of her mother's funeral, with a voice-over from her father commanding her to always hide her emotions from other people. Sharla and Shingo attempt to cheer her up, but she brushes them off.

As children put some finishing touches on their house, Howard emerges from the forest, leading Bell, who is bowed under the weight of one of the shuttle's seats, intended for Howard's exclusive use. Luna protests that if Howard wants the seat, he should carry it himself. They declare the house almost complete, lacking only a front door, until Menori suggests a shower. Meanwhile, Kaoru works at narrowing a river with rocks to force the fish into a smaller area, but still finds them difficult to catch with his spear. While the other children collect wood to construct a shower room and leaves for shower curtains, Bell and Luna attack a pitcher plant, using logs to occupy the tentacle vines. They miss one, which catches Luna. Bell saves Luna, but berates himself for missing it. Luna tells him to have more confidence in himself. They return with the pitcher to use as a tank for the shower. That night, as Bell muses by the fire, Sharla comes to remind him of all the good things he's done for them.

Two weeks later, the children have returned their efforts to food-gathering, but they find they've already picked the nearby trees clean of fruit. They decide to go further afield the next day, but all are concerned about Kaoru's habit of doing his own thing. The following day, Bell, Luna and Chako find potatoes, while Kaoru and Sharla check the fish trap, but find it empty. Kaoru walks away to hunt on his own, but Sharla turns back to see fish swim into the trap. Kaoru arrives to dinner late, having caught a small lizard while hunting. Later that night, Luna brings Kaoru dinner as he sharpens his knife in the cleaning area, and she tells him that he doesn't have to act alone - they're stronger if they work together.

After stopping work for the day, Luna goes to wash her hands in the lake. As she remembers the other times she saw strange visions while in the lake, she suddenly sees a vision showing a journey down a river into the Eastern Forest, and a voice telling her to come. That night, she tells the others about her desire to go there, and Howard and Bell volunteer to join her. Bell and Luna build a raft out of bamboo, while Howard makes a bow. Shingo and Menori are working the field, until Shingo suddenly collapses. They leave him to rest in the shade of the Magnificent Tree, and he sits starting at a photo of his family.

Luna, Bell and Howard set off down the river. The journey is largely uneventful, until they encounter a waterfall. The raft breaks up, throwing them into the river. As Luna tries to hold onto her father's backpack, both she and Bell get swept over the waterfall. Bell manages to pull Luna and her backpack to shore, while Howard climbs down a rope. The trio are surprised to see that everything in the forest is huge - plants, insects and animals. They are attacked by a giant boar, but the Luna hears the mysterious voice, which saves them. They find a cave in which to spend the night.

As Luna, Bell and Howard head deeper into the Eastern Forest, Shingo works on the communication system back at the house, but is frustrated that he doesn't have enough parts. Shingo and Chako return to the shuttle for more parts, but Shingo gets angry at Chako's dismissive attitude. Later, he tries to operate the communications device using Chako as a power supply, but is unsuccessful.

Meanwhile, as Luna, Bell and Howard get deeper into the forest, Luna starts to hear the voice more often. They also find they can jump much higher than usual. Eventually, they encounter some sort of overgrown ruin. Luna's head starts hurting and she suddenly sees an image of an alien family. As the trio approaches the ruin, a giant crustacean suddenly emerges from the water surrounding it. It chases Howard, but gets crushed under a boulder. Howard grabs a piece of one leg as a trophy, but a second crustacean attacks. They flee back to the cliff they climbed down. Pague, who had come to visit the house, suddenly becomes agitated and runs away, followed by Kaoru and Menori. They reach the cliff above the Eastern Forest just in time to pull Luna, Bell and Howard out of reach of the crustacean.

Chako and Shingo investigate the machine, and determine it to be a nano-plant - a collection of nanomachines - that was controlling the crustacean. They realize the nano-plant means there is intelligent life somewhere on the planet. Shingo announces that he might be able to use the nano-plant to fix the communications system, but Howard assumes that Shingo is guaranteed to be successful and gets excited. Despite working all night, Shingo isn't finished by the next morning - Howard, however, continues with his unreasonable expectations. Howard and Shingo get into a heated argument, which ends with Shingo storming off. Luna comes to the conclusion that Shingo is homesick - being two years younger than the rest of the children, he feels it much worse.

The children are forced to put their plans to re-visit the ruins on hold when Luna develops a high fever. On Chako's advice, they split up to search for medicinal foods and plants for her - Chako and Sharla look for an arrowroot-analogue, Bell and Shingo look for mugwort, Kaoru goes to get eggs, Howard looks for fruit, and Menori remains behind to take care of Luna. The hunt for arrowroot is difficult, worsened by the arrival of bad weather, but Sharla insists on continuing, even after badly scraping her knee. Sharla wants to be strong for Luna, so Chako tells her the story of her first meeting with Luna, shortly after her mother died. Chako tells Sharla the secret of Luna's strength - to remember that even when bad things come, there's always a blue sky in your heart.

The children discuss the boy, and the possibility of first contact with aliens, and Luna remembers the image of the alien family that she'd seen the first time she came to the ruins. Luna looks at the boy in thought, while the other children push random buttons on a nearby console to see what happens. Suddenly, a hologram of the planet appears, showing several locations marked. The planet starts red, but blue areas start spreading from each marked location. In the cold-sleep capsule, the boy suddenly opens his eyes. They all hear the voice that Luna had heard earlier - it says "Alduram Gyet", and when Luna places her hand on the capsule and repeats it, the capsule opens. As the child gets out and stands up, a card comes out of the cold-sleep capsule's control panel. When they take the card, the ruins start shutting down, and the door starts closing. The children escape with the alien boy just in time.

The children try to open the door again and search for another door to go back inside, but are unsuccessful. Chako estimates the ruins to be five hundred to a thousand years old. They discuss what to do with the alien boy, and Luna resolves to take him back with them, despite the strain he may put on their resources. They head back, but unnoticed by them, the ruins start to emit a shiny substance from the top.

The next day, Howard volunteers to look after the boy - who seems to be unable to speak - in order to get out of doing more strenuous work. Luna thinks Alduram Gyet is the boy's name, but Howard, unable to pronounce it, dubs him Adam. Chako and Shingo study the card from the ruins. Howard attempts to teach Adam how to steal fruit without being caught, but while Howard is distracted, Adam fills his arms with fruit and starts throwing them around. Menori scolds him for wasting food, and Howard accidentally reveals that he was teaching Adam to steal. Adam tries to help the others in their tasks, but whatever he does to help, Menori scolds him for messing up. Later, Menori plays her violin, and Adam sits listening, enthralled. That night, the children try to teach Adam to say their names, but Adam is only interested in Menori. He tries to get her to play her violin, but Menori becomes angry at him for touching it. Menori tells Luna she has no idea what to do with children, but Luna tells her she just needs to smile.

As the weather continues to become colder and more overcast, Luna, Shingo and Chako return to the ruins to investigate it as a warmer place to live, but are unable to find a way in. Chako takes a sample of the substance being emitted from the top, and the three return to Everyone's House. Menori and Howard scavenge the upholstery from the shuttle's seats to make cloaks. Bell, foreseeing colder weather to come, wants everyone to move to a cave. However, despite Bell's enthusiasm for its shape and location, the cave's rocky floor and dank atmosphere don't endear it to any of the other children, who are reluctant to leave the house they worked so hard to build. Bell decides to work on his own.

Two weeks later, the snow lies thick on the ground, but in the cave - named "Star Hole" by Sharla - the children are surviving. Pague is living in a rock shelter nearby, but he is suffering in the cold, and leaves for him to eat are getting scarcer. Bell, Shingo and Chako return to the ruins to find a way in and shut it down, trying to interface the communications system with the card that came from Adam's cold-sleep capsule, but are unsuccessful. On the way back, however, they find a valley full of other creatures like Pague, which is kept warm and fertile by a hot spring.

A blizzard has been going on for ten days, preventing any of the children from leaving the cave. Shingo, Chako and Adam use the opportunity to investigate the card they found in the ruins. They realize the card is a biometric identification system, encoded to respond only to Adam. Bell, Luna, Shingo, Chako and Adam brave the blizzard to head for the ruins. While they stop for the night en route, Adam dreams about his parents. Chako starts shutting down due to the extreme cold, but at her insistence, they press on. They reach the ruins and try to open the door, but Chako collapses. Adam cries out for her, and suddenly the card lifts into the air, glowing green, and the door opens.

Back at Star Hole, Adam has a dream in which he sees his parents in some sort of control room. He sees his mother coughing, then they place him in the cold-sleep capsule, and he awakes with a start. Later, the children discuss the dream. Chako and Shingo believe the ruins are a spaceship, and want to return with Adam to spend several days investigating. Kaoru takes them there, while the rest of the children move back to Everyone's House. Five days pass while Chako and Shingo investigate every nook and cranny in the ruins, and Adam tries to recall the memory of his parents. Adam eventually remembers his mother's last words - "for the sake of the future", and when he speaks them out loud, the walls light up, and the centre of the room's floor lowers down, revealing a hidden door to the control room.

Shingo is able to make contact with the newly arrived spaceship, the Orion, who reveal that they need a replacement gyrostabilizer, before the radio cuts off as the ship enters the atmosphere. Adam fears that he'll be left behind alone if they get rescued, but Luna promises to take him with them. The children run to the four sides of the island to make signal fires so that the ship can find them. Howard gets the closest one, the eastern end, and starts his fire, Adam, Chako and Shingo stay at the ruins, and the rest of them head west. While waiting to climb the rope up the cliff leading out of the Eastern Forest, Kaoru decides to investigate behind the waterfall, and finds a cave leading up to the top. They then split up to head for the north, west and south extremities of the island.

Kaoru finds the escape pod from the Orion washed up on the shore, and brings the occupant - an old man - to the rest of the children. When the old man wakes, he hurriedly puts out their signal fire, telling them the people on the ship are escaped prisoners. They'd hijacked the ship and killed the rest of the crew, only to be sucked through a gravity storm, finding themselves near the planet, where they picked up Shingo's signal. The old man, named Porte, was the ship's mechanic - he sabotaged the ship as it came in to land, stealing the spare gravity control device before escaping. He also realizes he knows who the children are - their disappearance was big news throughout known space, and Howard's father had offered a large reward for their safe return.

Howard has stolen the gyrostabilizer from the ruins and is taking it to the three escapees to bargain it exchange for their rescue, with the added incentive of the reward they would get for the children's safe return. The escapees tell Howard they can only take one person with them, so Howard decides to accept the offer, and send help for the others later. Once the escapees have the gyrostabilizer, however, they turn on Howard and are about to kill him, until they realize that Howard took the wrong component.

Menori, acting as spokesperson, tells the escapees to put down their weapons and move away from them, and Brindo plays along. They start the hostage exchange, but Brindo catches Kaoru heading towards the discarded weapons, and Zilba pulls out a needle gun and shoots at him. In the resulting confrontation, Howard gets hit by a needle. The children cross the river to escape, but find themselves still in range of Brindo's laser gun. Things look dire until Adam arrives, followed by the giant crustacean from the ruins, acting under Adam's unconscious control, which distracts the escapees long enough for the children to escape. They head for the ruins, relying on the illusory forest to slow the escapees down, leaving Kaoru behind to watch them.

The escapees are becoming increasingly frustrated by the illusory forest, while Porte, Chako and Shingo make some progress in interfacing the gravity control unit with the alien equipment. The children get excited, but Kaoru returns with sobering news - the escapees are starting to figure out the forest. Since Porte needs two or three more days, Kaoru, Bell, Luna and Menori plan traps to slow them down. Adam, looking dejected, sneaks out and finds Pague in the illusory forest outside. He confides in Pague that despite Luna's offer to take him back to their colony with them, he doesn't really want to go - this planet is his home.

The children put their plans into action, first separating the escapees, then trapping Bob in a cage and catching Brindo in a snare. However, Kaoru is tied down fighting Zilba. Brindo quickly frees himself, and soon corners Luna, Bell and Menori, but Kaoru shoots the gun out of his hand with an arrow, and Bell smashes it with a rock. Bob also breaks free, and the three regroup and close in on the children. Suddenly, the herd of pagues - with Pague himself in their midst - stampedes between the two groups, allowing the children time to escape. When the herd moves on, Bob tries to follow the children, and falls into a pit trap.

Knowing they can't sacrifice Pague for their own benefit, the children decide to give up on fixing the ruins and steal the Orion instead. They hide in the control room and close up the floor, then open up the outer door. They lure the escapees into the inner chamber with the terraforming device, then lock them inside, open the floor once again and escape, taking the gyrostabilizer with them and closing the door behind them. They head for the beach, but behind them, Bob batters down the inner door, and Brindo uses a miniature bomb on the outer door.

On the Orion, Kaoru familiarizes himself with the controls, Porte, Shingo and Chako head for the engineering room, while Sharla and Adam hide in the aft cargo hold. On the beach, Bob makes a raft from logs, and as the children race to intercept, they cast off. Using Bob's cyborg arm as an outboard motor, they quickly move out of arrow rage. Luna uses her power to warn Adam, and he warns the others. Porte installs the gyrostabilizer and the engine powers up. However, as Kaoru begins liftoff, the escapees board the ship through the aft cargo hold's hatch. They pass Sharla and Adam without noticing them, and head for the bridge, where the rest have holed themselves up.

The children find Porte hanging from a tree and bind his wounds, then head for the ruins. There, they find that both the Orion and the ruins have been all but destroyed. The children are all stunned, but Adam is especially distraught, as the ruins represented his only link to his parents. Luna suggests heading to the mainland to find the main terraforming machine, as they may also find another spaceship there, but the others, still reeling from the shock, decide it would be better to rebuild the basis of their lifestyle first, and consider bigger things afterwards.

With Shingo designing and Porte giving technical advice while recuperating from his injuries, the children start to build their ship with Pague's help, using the largely intact hull of the Orion for the main body, and searching the forest and ruins for parts and components. However, a disagreement caused by lack of parts is starting to open a rift between Shingo and Porte. Since the gravity control unit they found wouldn't be powerful enough to produce both lift and propulsion for their ship, Shingo comes up with the idea of using sail power for propulsion, but Porte rejects it outright, not willing to ignore centuries of tradition in spaceship construction.

As the children finish construction on the ship and load supplies for the journey, Porte visits each one except Shingo and gives them words of advice and encouragement. The children turn to Sharla to give the ship a name, but she asks for time to think on it. That night, they head back to Everyone's House for their last night on the island. As Menori plays her violin, they think over the many things that have happened to them. Later, after everyone has gone to bed, Shingo finds Porte sitting by the fire. Porte gives Shingo his mechanic's jacket, and the two lie side-by-side.

A few days into the trip, first Shingo and Adam, then Menori, Sharla and Howard become incredibly seasick. In addition, the ship has become becalmed, causing some concerns over provisions. Howard and Menori try to talk Luna into turning back to the island they came from, but Luna stands by her original decision. Luna stands watch in the crow's nest, brooding over things and zoning out to the extent that she fails to notice a huge storm brewing right behind her, even when it is right on top of them.

As Kaoru and Chako struggle to keep the ship afloat in the storm, Bell and Luna try to furl the sail, but are unable to pull it against the strength of the wind until Howard and Menori emerge from below and help. Just as they finish, Sharla calls up from below - the sleeping room is filling with water. The children scramble to bail the water out, while Bell and Shingo work to seal the leak. As the storm abates outside, the children suddenly realize they're not feeling seasick anymore.

Bell tries to jump in after Luna, but the others hold him back. Kaoru attempts to turn the ship around, but because of the measures taken to avoid capsizing during the storm, the steering won't work. As Luna drifts out of sight, Shingo blames himself for not anticipating such a storm, but Chako is confident in Luna's ability to survive. In the ocean, Luna is being buffeted around by the waves, kept afloat only by her lifejacket and her memory of her father.

The next morning, she awakens on the beach of a small sand cay. She spends the day trying to find food and water, and start a fire, but she's unsuccessful, only getting blistered palms and a cut on her hand for her troubles. After sunset, she finally manages to start a fire using a bow drill which she'd once seen in a movie. As she stares at the fire, she remembers a time when her father took her camping in a colony forest dome once, when they talked about terraforming other planets to make them fit for human habitation.

Heading for the continent once more, the children have realized that something happened to Luna on the island. Chako scans Luna and discovers nanomachines in her bloodstream, which were the reason for her quick healing. She scans the rest of the children as well, but only Adam has them too, which explains why Luna and Adam are able to communicate, why Luna could hear the mysterious voice, and why she could open the door to the ruins. Luna is extremely concerned that she has nanomachines, but tries to behave as normal in front of the other children. However, they can tell that it's just an act, and after three days, they plan a cheer-up-Luna surprise party.

While Luna spends the day sleeping, Howard tries to catch a fish for a main dish, and the rest of the children prepare the deck for the party. Howard is having no success, but as Chako comes to check on him, an enormous fish suddenly bites his line, dragging Howard into the water. Kaoru stops the ship, and then kills the fish with a spear. After sunset, Luna comes up on deck to start her shift, and the children all spring the surprise party on her. They have a meal prepared for her, then put on a play written by Sharla.

Kaoru pilots the Orion up a river to find a place where they can come to shore, and they decide to stop for lunch on solid ground. As the children set up a picnic, they all notice that Sharla has become a much stronger person than she used to be, and conversation quickly turns to everyone's parents. Luna, however, as the only one of the human children who is an orphan, becomes saddened by the conversation, and Bell notices. As the children plan their route, they decide to spend the day replenishing their supplies. Suddenly, an earthquake occurs.

Kaoru fishes, Chako and Shingo check the ship, Luna and Bell find an edible cactus, and Sharla and Howard discover a pair of ostrich-like birds taking care of a nest. The children all go to see, but the male chases them away, and Adam trips over, scraping his hands. Later, Bell goes to help Luna make dinner, and he clumsily offers to be Luna's family since she has no one else. Howard, overhearing, misunderstands it as a marriage proposal, and tells the rest. When they come back to the group, Howard teases Bell, causing him to run away, and Luna follows. The two go back to see the nest again, and Luna tells Bell that she's realized she's not alone like she thought - she has all of the other children as a family.

On the Orion, Chako determines that virus-like nanomachines have entered Adam's body and changed the nanomachines already there into malignant ones, and they probably entered through the scrape on his hand. They decide to head directly for the nearest sub-terraforming machine. After passing through a forest, they reach an ancient, crumbling city. They stop by a large building that they hope is a hospital, but the medicines they find had already decomposed long ago. Chako estimates them to be five hundred to a thousand years old, the same age as Adam's ruins. When Howard finds writing on a medicine bottle that's the same as writing they saw in the ruins, they realize that Adam's people had come from this planet, which raises the question of why he was in a spaceship on the island.

The children enter the terraforming machine, leaving Sharla behind to look after Adam. Inside, Luna finds a stairway leading deeper, where they are attacked by a large humanoid robot, which Chako identifies as a maintenance robot. They defeat it when Kaoru plunges his knife into its head. The strange voice which Luna heard earlier speaks to Luna through the robot. It identifies itself as the main computer that manages the terraforming machines, Survive. With Luna translating for the other children, Survive recounts the history of the planet.

A thousand years ago it was inhabited a people with a high level of technology, but environmental catastrophes were making it uninhabitable - things such as ozone depletion, pollution, and large-scale tectonic events. The majority of the people built a huge fleet of ships and escaped into space, but some of them remained behind and built terraforming machines to revitalize the planet, creating Survive - who was built into a spaceship - to help manage it. As they began to work, they realized that it would take a thousand years for the planet to return to normal, and sent a message to those who left to let them know. At the same time, Survive came to the conclusion that the people were the cause of the damage to the planet, and in order to protect the planet, it had to kill the people. It released a virus-type nanomachine which caused all of the people to die.

The Orion travels through a desert, but progress is slow, as sand keeps getting into the engine room, forcing them to stop while Shingo and Chako clean it. When they're on the move again, they have lunch together, but food and water supplies are starting to get low. To cheer them up, Sharla shows everyone a desert flower that she found, made of crystallized sand, but Howard, getting frustrated and afraid, grabs it and smashes it on the floor. Adam realizes that Sharla has been sharing her water ration amongst everyone else, and tells Luna, but Sharla promises Luna that she's ok.

The children sit stunned by the side of the quicksand pit. Luna and Shingo each blame themselves - Luna for suggesting they go to the mainland, and Shingo because the Orion was his design. Menori, knowing that they would never survive in the desert in the day, forces them all to start walking. They walk by night and rest by day, reaching a forest at the edge of the desert the following night. Chako tries to lighten the mood, but Shingo becomes angry at Menori's hard-line stance and the two get into an argument. As they lie down to sleep, they all recall memories of Howard and Sharla.

The next day, the children continue through the forest, soon reaching a ruined city. When they enter the city, they are immediately chased by three drones. Luna and Kaoru act as decoys to allow the rest to escape, but Shingo, still feeling guilty, tries to sacrifice himself to the drones, but Menori saves him, and the two run into a sewer to escape. Shingo tells Menori he's better off dead, but she slaps him and asks him if Sharla or Howard would be happy if he died. A drone attacks them, and when Shingo tries to protect Menori, Howard's mirror - which was in his jacket around Shingo's shoulders - flies out and distracts the drone, causing it to shoot the ceiling above itself, crushing it.

The children find a door in the hull, which opens when Luna holds up her hand. Inside, they encounter a maze of passageways, but drones quickly find them and they are forced to flee. After they run past one section of corridor, a small being emerges from a hatch in the wall, and instantly recognizes Adam. The small being, who speaks a language only Luna and Adam can understand, asks the children to follow him, but assuming him to be another enemy, they run from him. When the drones chase the being instead of them, they realize they can probably trust him, and when he appears in front of them from another hatch, they decide to follow him.

He leads them to a room near the bottom of the spaceship that's hidden from Survive's control, where Chako, realizing the being is a robot, reprograms him to speak a language the children can understand. He introduces himself as Tswarkom, but Chako decides that's too difficult to pronounce and dubs him Tako. Tako shows Adam a message from his parents, in which they explain they placed him in the ruins to keep him safe from Survive, to be awoken from cold sleep after the planet's restoration was complete. The ruins would also provide someone to take care of him - Luna - but in doing so would leave them open to infiltration by Survive, which is why it became so cold.

Outside, the children gather food while avoiding the drones. They discuss how much the area reminds them of their island, and Adam is excited to see a pague, except it's quite small. As the pague returns to its mother, two drones arrive, but someone shoots arrows at them from the bushes and destroys them. In a moment, Howard and Sharla emerge from the bushes. The children have a tearful reunion. Sharla tells the others that when they were sucked down by the quicksand, they fell into flowing water underground. Howard, however, sits in stoic silence. Sharla passes it off as him being tired, and prevents Chako from scanning him. When Luna and Sharla make skin-to-skin contact, Luna feels a weird sensation.

Later, when the children return to finding food, they discover that all the drones have disappeared, which concerns them. They tell Sharla about the hidden room. The pague and his mother return, and Sharla and Howard take him to play with it, but out of everyone's sight, they share sinister glances. They suggest to Adam that he pick flowers for Luna at the end of a tree branch overhanging the lake, but when he climbs the tree, Howard shakes the branch, causing Adam to fall into the water, and then jumps in after him. Adam calls out for Luna, and she, Bell and Howard dive in to save Adam and Howard. When Kaoru reaches Adam, Adam is already sinking, but Luna's power activates, and he starts floating up again.

Outside in the forest, Sharla stands communicating with a drone, agreeing to continue observing Luna. Elsewhere, Luna senses the drone, but when she and Kaoru run there, they only find Sharla. Worried, they head back to the hidden room. Together, they come up with a plan to reach Survive's chamber and accost the computer directly. The security drones act largely autonomously, guided by the sensors in each section - Shingo and Chako will use a modified chip to disable the sensors, meaning that so long as they stay out of direct sight of the drones, they won't be able to detect the children. Luna and Kaoru go with them for defense.

Chako reveals to the others what they suspected, that Howard and Sharla were being controlled by Survive. Luna and Kaoru follow Howard and Sharla, but encounter drones trying to force their way into the hidden room. They return to regroup, but realizing there are no more safe places to hide, they decide to attempt a frontal assault on Survive's room. Shingo finds two infrared inhibitor particle nebulizers which they can use to confuse the drone's sensors in the same way that Howard's mirror worked earlier. In Survive's room, Survive tells Howard and Sharla that he needs to obtain Luna's power for himself.

The children escape the hidden room, and split into two groups for a two-pronged assault and ride separate lifts to the top of the spaceship. The nebulizers work on the drones, but Sharla confronts one of the groups with a laser pistol. Bell distracts her with his jacket, and then knocks her out. In the other group, the drones destroy Kaoru's nebulizer, but Luna's power flares up and disables the drones. They enter Survive's room, where they find Howard lying on the floor, but when they approach, he stands up and holds a laser pistol to Adam's head.

Survive starts to scan Luna to determine the source of her power, and the other group arrives with Sharla. Survive tells Luna he caused the quicksand in order to take Howard and Sharla, and has been using them for various experiments since. Luna becomes angry at the callous use of her friends, and her aura changes from pink to dark red, but Adam brings her back to her senses. As Survive continues to taunt her, she remembers her father's words on terraforming, and her aura turns pink again. The children all appear in a strange landscape, where they call out to Howard and Sharla, and they remember all the things that happened to them since they arrived. In Survive's room, the children are all surrounded by a whirling pink field. Luna gathers her energies and those of her friends in her hand, and blasts the nanomachines out of Howard and Sharla's bodies, returning them to normal.

Survive shows the children images of earthquakes causing damage all over the continent, but he cannot determine the cause of them. He explains that he needs Luna's power to save the planet, even if he has to absorb her to get it. The children discuss escaping the planet, but Survive threatens them with a huge swarm of drones. Luna offers to investigate the cause of the imminent destruction in exchange for their safety - though Survive is supremely logical and has access to all the data, the humans have the ability to see connections and make intuitive deductions.

Survive agrees, and the children split up to investigate - Shingo and Chako go over the data, and Tako takes the others in an anti-gravity sled to do field investigation in the volcano under the main terraforming machine. They ride an elevator down an investigation shaft, taking samples of rocks over the last thousand years, and a magma sample, but another earthquake strikes and the elevator's mechanics fail, including the refrigeration system. Held in place only by the emergency brakes, the children are at risk of burning to death from the heat of the magma, but Shingo comes up with the idea of exploding the refrigeration system's compressed air tanks to push the elevator up the shaft.

Survive has detected the gravity storm approaching, on a direct collision course with the planet, due to arrive in three days. Shingo thinks they can save the planet by using the gravity control unit on Survive's spaceship to create an inverse gravity field, cancelling out the gravity storm. With Survive's computing power, the children test a simulation using the anti-gravity sled's smaller unit, and are successful. However, since the plan requires detaching the gravity control unit from Survive's ship and sending it into the storm, Howard and Menori object, saying they should use the ship to return home while they can - there are no other spaceships or sufficiently powerful gravity control units on the planet. The other children agree that they have to save the planet, and Howard storms off.

Sharla follows Howard into the forest outside, while Kaoru, Shingo, Chako and Tako go to check the condition of the ship, and Bell talks with Menori. Survive wants to carry out the plan immediately, but Luna convinces him to wait - she knows there's no way the other children, even Howard or Menori, would want to see the planet destroyed.

The children spend time preparing for departure - learning how to fly the ship, testing systems, ensuring everything is ready. On their last night before they start the mission, the children all gather in the forest by the lake, and remember the events that brought them to this point. Howard worries that it might be their last night, but Kaoru tells him they're not going so they can die - it's so they can live. The next day, they evacuate all of the coffins from the ship, leaving Adam and Tako behind to take care of them and the planet, and then prepare for takeoff. With Kaoru as pilot and commander, Shingo on engineering, Chako looking after the computer, Bell on power systems, Menori and Luna on flight plan and navigation, Howard on life support, and Sharla on communications, the takeoff happens without a hitch.

Suddenly, the gravity storm's power level increases. The children make plans to compensate, but Survive, not willing to risk himself on a plan that now has only a small probability of success, shuts down their control panels and starts taking the ship back to the planet. Luna runs to Survive's room to talk with him directly, telling him that even if their plan may not work if they try, the planet is guaranteed to be destroyed if they don't try. To give him courage, she agrees to let Survive absorb her. He does so, and her aura changes from pink to blue, and Survive's circuits power up to full. Luna explains to Survive the meaning of his name, and he gives control back to the children.

Shingo realizes that it is no longer possible to detach the gravity control unit from the ship - to stop the storm, they'll have to take the whole ship into the storm. Kaoru and Bell each volunteer to do it alone while the others escape, but the rest remind them they agreed to do it together. However, Luna, still with Survive, activates their seatbelts and ejects the entire bridge from the ship. She farewells each of them individually, then takes the ship into the gravity storm.

In the storm, Survive matches the storm's gravity field, and struggles to produce an inverse field as a blue aura spreads from the ship. The storm starts to overwhelm the ship, but as Luna pours more of her will and determination into it, the aura turns gold, then rainbow. However, it's too much for the ship, and it explodes, unable to destroy the gravity storm. However, on the planet, Tako realizes they were able to change the storm’s course by enough to avoid the planet. As the other children grieve for Luna, she finds herself floating in a strange space. Her father appears and congratulates her for a job well done. Promising her they'll meet again, he sends her back to the real world.

She awakens with a start inside a nanomachine shield projected by Survive, floating in space. With his mission complete and his support equipment gone, Survive charges Luna to continue his work and dissipates. Suddenly, the ships of the evacuation fleet that left the planet a thousand years ago appear, having received the message sent by Adam's parents and their colleagues. They give the children a spaceship which they can use to fly through the gravity storm before it disappears in order to return home, while Adam and Tako remain with his people to look after the planet. Menori gives Adam her violin, promising to return someday. As they fly away, they realize they never gave a name to the planet, and without hesitation Sharla names it Planet Survive. The ship enters the gravity storm.