A team of martial arts and weapon masters, led by the revenge-seeking Aika, hunt down and destroy yakuza organizations in Japan. When they meet up with the Black Bullet organization, however, they may have met their match.

When a young Yakuza torments the customers in a rival crime family's nightclub, it is not long before his dead body is found. Soon, inter-family retaliation follows, resulting in the death for a prominent crime boss. Devastated by this turn of events, the temperamental Kenzaki vows to avenge his boss's death and, as bloody violence ensues, the body count reaches excessive proportions.

Kasaki the hitman needs to set scores with his target Ri after the syndicate hunts him and blackmails his childhood friend to kill him.