The institute's beach volleyball coach got the surprise of his lifetime when the busty and seductive Saori Kiryuu came asking for special training to get over her embarrassment in a swimsuit. Unbeknownst to him, Saori's sister was watching the entire time, and she wants their sensei for herself. Now he must come to grips with having two very sexually charged young women in his life whilst attempting to maintain his composure as a teacher.