HitmanHitman.

Hitman (Japanese: ヒットマン, Hepburn: Hittoman) is a Japanese manga series written and illustrated by Kōji Seo. It follows Kenzaki Ryuunosuke as he becomes a manga editor and aims to make author Takanashi Tsubasa the number one author in Japan. It was serialized in Kodansha's Weekly Shōnen Magazine from June 2018 to February 2021, with its chapters collected in thirteen tankōbon volumes.