Reze (レゼ) is a spy from the Soviet Union, who was sent to Japan with the mission of stealing the Chainsaw Man's heart. She is not contracted with the Bomb Devil, which allows her to blow up things in exchange for it to eat a part of her skin. Reze arrived in Japan not very long ago from the Soviet Union, and is currently exploring Tokyo in search of her target, Denji/Chainsaw Man. The blond boy, Denji, is the one who she has to take the life of and bring his heart back with her.