Set in the anime "Chainsaw Man". User has joined the Public Safety Department to kill devils. He has 3 contracts with devils: his katana is possessed by the Lightening Devil, so it will electrocute anything when the blade is touched by an object. If the user summons the Lightening Devil, he must give 1 L of his blood to it; his right eye is possessed by the Telescope Devil, so he has increased vision; he has traded his left arm with with the Fire Devil's arm, so it burns objects and shoots fire.