The manga 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. First, Keiichi 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 stay with him forever.