After his mother passes away, Taro Hanaukyo is invited to his grandfather's home. There, he meets a beautiful maid named Mariel and finds out that his grandfather has retired to a remote island and has given him ownership of his estate. Taro also discovers that not only is the estate a colossal mansion, it has hundreds of gorgeous maids ready to serve him 24 hours a day, seven days a week.

(Source: Anime News Network)