Mitsuru Adachi
Katsu! (stylized as KATSU!) is a Japanese manga series written and illustrated by Mitsuru Adachi. It centers on a freshman student, Katsuki Satoyama, as he discovers his near-legendary skill in boxing. It was serialized in Shogakukan's "Weekly Shōnen Sunday" from August 2001 to March 2005, with its chapters collected in sixteen "tankōbon" volumes.