The world in which Denji was born was not at all kind to him: his father committed suicide, leaving him a mountain of debts to the Yakuza. Demons lurk everywhere, eager only to drag someone into a back alley and devour them. The only way for the young man to rid himself of debts and live at least an ordinary life is to kill those very demons. But with one of them, Denji managed to become friends and make a contract. After his father's death, Denji met a small wounded demon named Pochitu. By giving him his blood, he healed him and took from him a promise that each of them is obliged to help the other survive in this disgusting world.
