Kagetora Ryuudou is an extremely tall guy, aiming to become Japan's number one basketball player. He comes to AoiHigh, a formerly famous school to achieve that dream. But he's not the only one; Ichinomiya Chiaki has come there to play basketball as well. But Chiaki has a secret...Chiaki is normally a girl, but turns into a boy on the basketball court! Ryuudou, finding the secret out, is forced to become his/her roommate and partner.