The official YouTube channel for Kodansha’s Afternoon magazine began streaming an animated promotional video to celebrate the release of the first compiled book volume of Gyakusatsu Kigen (Genocide Origin), a new manga by Shiwasu Hoshikawa and Yūichirō Momose. The volume went on sale Thursday. Sōma Saitō provides narration for the video.
Production Credits
Takehiro Kubota (My Happy Marriage) handled storyboards, with Atsushi Ikariya and Keita Shimizu serving as key animators. Masakazu Miyake and Taichi Maezuka drew the backgrounds, while Tetsuya Tatamitani served as editor and compositing director of photography. Yashikin composed the music, and Ippei Tomari is credited for sound effects and casting.
Story Overview
The manga is set in a Japan plagued by relentless news of brutal crimes. High schooler Rakki is rescued from a fight with a classmate by a delinquent known only as “A.” When vicious murderers referred to simply as “K” and “D” subsequently appear, Rakki is confronted with the shocking truth behind the deaths of his classmates.
Hoshikawa and Momose launched the manga in Afternoon on May 25.
More from Shiwasu Hoshikawa
Hoshikawa launched the Bungo Stray Dogs STORM BRINGER manga adaptation in Kadokawa’s Monthly Shōnen Ace in January 2025. The series adapts the eighth light novel in Kafka Asagiri and Sango Harukawa’s Bungo Stray Dogs light novel series, with Kadokawa shipping the first compiled volume in September 2025.
Hoshikawa’s earlier manga Bungo Stray Dogs: Dazai, Chuuya, Age Fifteen concluded with its fourth and final compiled volume in October 2024. Originally launched in Kadokawa’s Shōnen Ace in September 2022, the series adapts the seventh light novel volume and explores the past of Osamu Dazai and Chuuya Nakahara. Yen Press publishes the manga in English.
More from Yūichirō Momose
In August 2025, Momose launched the Datewars project alongside character designer Hanaharu Naruko (Kamichu!, Gargantia on the Verdurous Planet, Kandagawa Jet Girls) and Mino as music producer, video creator, and music commentator. Billed as a “timeless music IP project,” it aims to revitalize musical styles from the 1970s through the 2000s, featuring 14 voice actresses, with plans to expand into manga, anime, mobile games, concerts, films, and stage events.
Momose also serves as the main scenario writer for King Records’ rap-themed Hypnosis Mic project, which launched in September 2017 and features voice actors rapping as original characters. The project’s first full album, Enter the Hypnosis Microphone, dropped in April 2018, and the group topped the rankings as Japan’s most popular voice actor Twitter account for 2018.
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