Based on

Movies like History of Japan’s Yakuza — Ambition Corps 4 (1999)

After the Tenryu-kai kill the Kameda-gumi boss and Wakagashira, the Kameda-gumi move to wipe them out. Executives Saigo, Katsuragi, and Hidaka exploit a weakness in Tenryu-kai officer Hashida to locate their hideout, setting the stage for a brutal all-out war.