Extremely Crushed (2014)

Bando, leader of the Bando-gumi (Hideo Nakano), is approached by a seemingly ordinary civilian, Keisuke Katagiri (Riki Takeuchi).
Katagiri impresses Bando by quickly selling a large batch of drugs under their control, earning his trust. But this is only the beginning—
Katagiri is secretly on a path of revenge for his elder brother Asahi (Masakatsu Funaki), who was assassinated by Bando. Before long, Katagiri becomes known in the underworld as a “Gokutsubushi” —
a man who doesn’t just kill a boss…
he wipes out entire syndicates from existence.