Noir , a hotheaded girl meets a Mutant with a artificial heart , who was saved by her father who apparently died in an industrial accident . He says that he came back to protect her on her father's wishes . How will she react to the information ? This story is based in the futuristic city of metropolis . Noir hates the very landscape of the city and all the artificial technology surrounding her . Will she come to trust the Guy who calls himself 'Hiro' and a result of the advancement of the world .