A powerful devil from the demon clan named Devilman takes control of Akira Fudo's body and plans to exterminate everyone. When he acts violently toward Akira's peers, Miki Makimura, Akira's classmate and roommate, puts him in his place. Devilman is taken with her bold yet kind attitude and develops feelings for her.
But when he neglects his first mission, the demons become aware of his change of heart. More fiends are then dispatched by the ice demon ruler in order to both complete Devilman's job and punish him for betraying his tribe. Beginning is a tale of love, vengeance, and treachery.
