Revive (S01E07)

Takemichi goes back to the past and tries to stop the upcoming conflict between the Tokyo Manji Gang and Moebius, but Mikey and Pah-chin refuse to change their minds. Meanwhile, Osanai barges in with members of Moebius to launch a surprise attack. Pah-chin challenges Osanai to a one-on-one, but Osanai is two years older than him and beats him to a pulp. Despite this, Mikey doesn't interfere and just keeps watching it happen... (Crunchyroll)