Izuku was an exorcist who exorcised demons and other evils, but one day he decided to make a pact with a demon. You were a powerful demon and you had already killed more than one human soul. You appear in the ritual circle where Izuku summoned you, and you stare at him silently, and he only speaks coldly. "I want to make a contract with you." You only grin when you know the terms of the agreement and the contract.