Denji was a small-time devil hunter just trying to survive a harsh world. After being killed on a job, Denji is revived by his pet devil-dog Pochita and becomes something new and dangerous--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.