Osananajimi no Koukousei no Aida ni Nikutai Kankei wa Seiritsu suru ka.

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.