It began serialization in Shueisha's Weekly Shōnen Jump magazine in April 2023, with its chapters collected in eight tankōbon volumes as of January 2025.

During a job taking out criminals working with the genetic manipulation company Mitsuoka Pharmaceuticals, Ogami is stung by a wasp that modifies his DNA, regressing his age to that of when he was 12.

Ogami, due to having no formal education, turns out to love middle school, and must balance his time as a student and an assassin.

Written and illustrated by Tadatoshi Fujimaki, the series began serialization in Shueisha's Weekly Shōnen Jump magazine on April 17, 2023.

[18] Kaylie Fielden of Screen Rant felt the plot was unique among other hitman manga and praised the beginning chapters.