The anime tells the story of college freshman Keiichi Morisato, who, because of his pure heart, has been chosen by Yggdrasil, Heaven's computer system, to receive a single wish. The angelic goddess Belldandy is sent down to Earth to ask for his wish, and tells him that he can potentially wish for anything that he wants, from becoming a billionaire to destroying the world in an instant. Keiichi first thinks that this entire meeting is a prank set up by his senpais, but during their short meeting, he soon realizes that she's the only person who truly understands and appreciates him. Being enchanted by her, Keiichi wishes that someone like Belldandy would stay with him forever, under the condition that the offer is valid. Ironically, he does not fully comprehend the outcome of his wish, and is stunned on realizing that Belldandy will now be living with him. The manga/anime follows their relationship as they become closer to each other.