Ah! My Goddess Summary:
Keiichi, a student at Nekomi Institute of Technology, calls a wrong number and ends up invoking Belldandy, goddess of the present. Belldandy grants him one wish, and he says: "I want you to stay forever". The wish is approved, and Keiichi is shortly thrown out of his all-male dorm. He settled in an old temple and is eventually joined by Belldandy's sisters Urd, troublemaking goddess of the past, and Skuld, mecha freak and goddess of the future.