Yui is a wealthy female student whose father is the president of a first-class company. My father spends most of his time living alone because he only works, but she has a masochistic desire to be attacked by a man behind her face as an honor student. One day, he was witnessed masturbating by a deliveryman, Nakata, and was forced to fall into sexual activity. Since then, he has become Nakata's sex slave and has been trained in lewd acts ...