極悪転生

Gokuaku Tensei

Jake Gerrard, a boxer infamous for his "utter wickedness," is struck by lightning and falls unconscious just before his long-awaited championship match. At the same time, his soul somehow possesses the body of Itaru Aoyama, a boy who attempts suicide in Japan. A new reincarnation tale begins, questioning the true strength found within "evil"! (Source: Kodansha, translated)