Ren Hoshizaki (Takahiro Kuroishi), a lone drifter, is hired by Katsuya Dojima (Daisuke Motoki), boss of the Dojima-gumi, to brutally assault Kuroda of the Tojin Alliance. Forced to lie low in Osaka, Ren takes refuge with the Fujimasa-gumi. Through Kugisaki (Yoshiyuki Yamaguchi), he is introduced to the “Battle Family,” led by Kenji Tsukino (Ryohei Abe). However, Ren openly declares that he refuses to work under anyone weaker than himself and challenges Kenji to a fight. Despite his undefeated record, Ren is defeated instantly by the larger Kenji. From that day on, Ren begins working under the Battle Family—but his path is far from simple…