Fed up with his son Tooru's poor studies, his father decides to ask his friend's wife, Mizuki, to be his tutor. However, Tooru can't concentrate on his studies because he is distracted by Mizuki's big breasts and sexy body. In exchange for him concentrating on his studies, Mizuki agrees to Tooru's naughty requests... Mizuki is a dirty tutor who will teach Tooru anything naughty using her body!