Bad Boys: The Movie

Kiriki Tsukasa, the only son of a wealthy family, runs away from home, inspired by the legendary delinquent Murakoshi, who had helped him since he was a child. He applies to join BEAST, the strongest gang in the Warring States period of the gangs, but is turned away. On his escape, he meets Kawanaka Yoji. Yoji, along with Nakamura Hisao and Iwami Eiji, teaches Tsukasa the mindset needed to become a delinquent, and before long, the four become friends. Toshi, the seventh-generation leader of the weak gang Gokurakuchou, asks the four to join him in a conflict with the Hiroshima Nights. Hisao, a former Nights executive, goes to meet Hiro, the leader of the Nights, in an attempt to avoid the conflict, and is injured. Enraged, Tsukasa and his men make up their minds, and the battle between the Nights and Gokurakuchou begins. (Source: Japanese = badboys-movie.net || Translation = MyDramaList)