A new original manga is on the way, bringing together two names that already have strong ties to the industry.
It was officially revealed in the June issue of Kodansha’s Afternoon magazine that Shiwasu Hoshikawa and Yūichirō Momose are teaming up for a brand-new series titled Gyakusatsu Kigen (Genocide Origin). The manga is scheduled to debut in the magazine’s next issue on May 25.
A Collaboration Between Experienced Creators
This project brings together Hoshikawa, who has been actively working on manga adaptations tied to major franchises, and Momose, best known for his work as a scenario writer on Hypnosis Mic.
Hoshikawa has been closely associated with the Bungo Stray Dogs universe in recent years. In early 2025, he began serializing the manga adaptation of STORM BRINGER, which is based on the eighth light novel from Kafka Asagiri and Sango Harukawa’s series. The first compiled volume of that adaptation was released in September.
Before that, he also worked on Dazai, Chuuya, Age Fifteen, another adaptation within the same franchise. That series ran from 2022 and concluded with its fourth and final volume in October 2024, focusing on the early relationship between Osamu Dazai and Chuuya Nakahara.
Momose’s Expanding Creative Portfolio
On the other side of the collaboration, Yūichirō Momose brings experience from large multimedia projects. He is widely recognized as the main scenario writer behind Hypnosis Mic, a rap-themed franchise that mixes voice acting, music and storytelling.
Since its launch in 2017, Hypnosis Mic has grown into a major cross-media success, spanning albums, anime adaptations and live events. Its popularity was strong enough to even place it among the most followed voice actor-related accounts on social media in Japan during its peak.
More recently, Momose also launched the Datewars project in 2025, a music-driven IP designed to reinterpret musical styles from past decades. The project already has plans to expand into multiple formats, including manga, anime, games and live performances.
What to Expect From Gyakusatsu Kigen
While specific plot details about Gyakusatsu Kigen have not been revealed yet, the title itself suggests a darker and potentially more intense narrative direction. Given the backgrounds of both creators, there’s a strong possibility the series will blend character-driven storytelling with a more complex or dramatic tone.
The fact that it’s being published in Afternoon magazine also hints at a slightly more mature target audience, compared to standard shonen releases.
With its debut set for May 25, it won’t take long before more details about the story, themes and characters start to surface.
