After the demise of his mother, Taro Hanaukyo is summoned to his grandpa's abode where he is acquainted with a striking maid named Mariel. His grandpa reveals that he has moved to an isolated isle and bestowed upon Taro the title of the proprietor of his colossal property. Taro is taken aback by the grandeur of the mansion and the countless charming maids who are at his beck and call 24/7.