Matsumoto Ichika is a somewhat famous female student with a passion for challenging the boys in school. One time she received a challenging letter from an unknown person, the reward was Winning will be a large amount of money, but if you lose, you must agree to do what he asks. Of course she agreed. The day of the confrontation finally came, after a fierce battle, Kojima finally accepted defeat because of his subjectivity and arrogance. The conditions that the other guy gave were not too difficult to fulfill, as long as she was naked and obediently served, helping him satisfy his sexual needs, that was enough.