Following his release from the reformatory, Hayato is a free man and begins working at a Korean host club, the same one Yoshio works at. Unable to handle the woman and work he immediately wants to quit. However, Yoshio soon ends up saddled with a large debt a customer has made and is forced to pay with his life in an illegal underground fighting match. To save Yoshio, Hayato enters instead and comes up against Honda an ex-pro boxer.

関東中央少年院での長い刑期を終え、ついに自由の身となった黒永勇人は、義男が働く歌舞伎町の韓流ホストクラブで働きはじめるが、金のために女に媚びることが我慢できず、すぐにやめてしまう。一方、義男は客がつくった借金を背負わされ、地下賭けファイト「闇拳倶楽部」に出場するハメに。そんな義男を救うため、闇拳倶楽部に乗り込む勇人だったが……。