Chiaki Asami was transferred to Shuurin High School into the Suzuka Dorm, and there Nachi Kirishima who had a beautiful face like a model is to be his roommate. When he’s just getting accustomed to dormitory life, a welcome party for Chiaki suggested by Nachi is carried out. One night, Chiaki encounters lewd play between Nachi, Shinobu, and Haru…