Denji's a poor young man who'll do anything for money, even hunting down devils with his pet devil-dog Pochita. But his life gets turned upside down when he's betrayed by someone he trusts. Now with the power of a devil inside him, Denji's become a whole new man—Chainsaw Man!

Having been forced to kill a friend, Denji finds that his brain has turned to mush from despair. Without the motivation to keep going, he seeks help from Makima. But Makima is not what she appears, and Denji’s pain is only just beginning.