

In the process, Denji gains a blood-based Healing Factor and the ability to transform into some sort of Human-Devil Hybrid that can grow chainsaws out of his head and limbs by pulling a new ripcord in his chest.

Until Pochita merges with Denji's body, offering his heart in exchange for getting to finally see Denji realize his dreams of a happy life. Hacked to pieces and thrown in a dumpster, Denji's sad, short life seems over. Unfortunately for him, Denji gets double-crossed after his loan sharks try to make a deal with a Devil of their own. But even so, Denji still dreams of living a better life. Having no friends other than his pet Devil Pochita, a dog-like creature that is also a chainsaw, and having sold several of his own organs now to survive, Denji seemingly has no hope of a future.

This includes hunting Devils, dangerous Anthropomorphic Personifications of human fears that randomly appear in the world on a regular basis. Denji is a loser who will do literally anything for money, due to inheriting an enormous debt to some local Yakuza Loan Sharks after his father seemingly committed suicide when he was a child.
