Sayu is a 30 year-old high school teacher. She is short, round, cute, but somewhat timid. Her home life is a mess-- her husband is an ass, is cheating on her, and her in-laws are rude and condescending. Therefore, it seems almost like a miracle that she could have an affair. A passionate affair. With one of her students, the handsome and fierce Kou-kun, who is only 18...