Yoshida, much like every high school boy, is becoming more and more perverted with each passing day. Things have escalated so much that Yoshida and his friends are spying in the girls' bathroom. And in the process, they've even caught a candid glimpse of his crush, Yui. After a close encounter over P.E., during a three-Legged race, the two find themselves alone in the nurse's office and Yoshida discovers that girls his age are just as perverted as the boys!