RetBear Performs Opening Theme for Zombies Anime
The theme song reveal lands months ahead of the January 2027 broadcast and doubles as the first new RetBear material since January 2023, so the tie-in is also the project's comeback release.
Key Facts
- RetBear will perform "No Reaction" as the opening theme for the TV anime In a World Full of Zombies I'm the Only One Who Doesn't Get Attacked.
- The song is produced by Kairiki Bear and features a guest vocalist credited as unknown Vo: 0in.
- The anime is scheduled to begin airing on AT-X in January 2027.
- The source manga has recorded more than 9.5 million downloads and sold over 750,000 copies, including spin-offs.
- "No Reaction" is RetBear's first new release in almost four years, since "Down Timer" in January 2023.
Reporting from 2 sources: Honey's Anime, OtakuKart Anime.
RetBear will perform "No Reaction" as the opening theme for the TV anime adaptation of In a World Full of Zombies I'm the Only One Who Doesn't Get Attacked. The song is produced by Kairiki Bear, the Vocaloid creator behind "Venom" and "Darling Dance," and features a guest vocalist credited only as unknown Vo: 0in. The announcement was made on October 10, which is also World Zombie Day, alongside the reveal of the anime's key visual and main promotional video. The series is scheduled to begin airing on AT-X in January 2027. The source manga has recorded more than 9.5 million downloads and sold over 750,000 copies, including spin-offs. "No Reaction" is RetBear's first new release in almost four years, following "Down Timer" in January 2023. Digital streaming details for the song have not yet been announced.
RetBear is a project led by Kairiki Bear that pairs the producer with a different anonymous vocalist on each release. The guest on "No Reaction" is credited as unknown Vo: 0in, one in a line of numbered aliases: unknown Vo: 10fu sang "Mannaka DEAD END" for Black Summoner and unknown Vo: O2 sang "Down Timer" for REVENGER.
The two outlets differ on the size of Kairiki Bear's channel. OtakuKart puts it at more than 470 million total views; Honey's Anime says over 480 million. Honey's Anime also cites view counts for individual Kairiki Bear songs: "Venom" at 75 million YouTube views and "Darling Dance" at 49 million.
- "Mannaka DEAD END" (unknown Vo: 10fu), opening theme for Black Summoner
- "Down Timer" (unknown Vo: O2), opening theme for REVENGER, released January 2023
- "No Reaction" (unknown Vo: 0in), opening theme for In a World Full of Zombies I'm the Only One Who Doesn't Get Attacked
Honey's Anime credits the details to an official press release. The main promotional video is available on YouTube, and the song's streaming information is listed as coming soon.
Synthesized by Yomimono from the 2 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.