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On June 23, 2024, the production committee of the anime Dandadan announced that Creepy Nuts, the band that created the hit opening, Bling-Bang-Bang-Born, would perform the opening theme song for the anime, titled "Otonoke". One half of the duo R-Shitei described that the song interpreted "how when supernatural beings or spirits possess people, they 'resonate with and connect with pain and sadness', which is very similar to the relationship between music creators and listeners." The snippet of "Otonoke" first featured on the anime's third trailer, previewed on August 20. The duo released the song digitally on October 4, and physically on CD single on December 11.
A month after the release, a user on the website Reddit discovered that the song had artifacts of sampling from a sped and pitched-up excerpt of the 1915 song "I've Been Floating Down the Old Green River" performed by American singer Billy Murray, disproving a popular theory that the song had sampled sounds from the Pikmin series of video games.
Music video
A music video for "Otonoke" premiered on October 18, 2024. Directed by Masaki Watanabe, the chaotic music video expresses the dark atmosphere of the song by using several visual techniques, including Creepy Nuts in phenakistoscope and zoetrope created by 3D scanning as well as "Fatman Scoop-style big head" effects. The collaborated music video with Dandadan was released on October 31.