While on various cases, all the Special Division members were attacked by Gun Devil's henchmen using guns, killing almost all.
At the same time, Denji, Power, Himeno and Aki are eating at a restaurant. They are suddenly attacked by Yakuza members wielding guns, leading to heavy casualties. The attacker reveals himself to be a human-devil hybrid, the grandson of the Yakuza boss Denji killed, who seeks to harvest Denji’s heart.
Seeking vengeance against Denji, Katana Man teams up with Akane Sawatari, a Devil Hunter who works for Gun Devil, to kill Denji.
