Yakuza Requiem: The Men's Requiem (2011)

Goro, a member of the Kai Group, and his younger associate, Minoru, face a devastating turn of events. One day, Minoru's younger brother gets caught up in a conflict with the Kitou Group and is killed. However, due to the delicate relationship between the groups, their boss forbids them from taking any form of revenge. Consumed by rage, Minoru vows to avenge his brother, and Goro, willing to give up everything, heads towards retaliation for Minoru...