幼なじみの高校生のあいだに肉体関係は成立するか。

The innocent Oota Yuka, the sexually curious Niiyama Kasumi, the elusive Horie Yasuo and the lovesick Onosaka Ryuhei. The four high school boys and girls, who have grown up like a family, are bequeathed a house by an elderly woman, Hasebe Haru, for four million yen and a fixed term. Under one roof, the high school students' eccentric love and friendship unfold.