Shigeo's girlfriend Ayaka is serious now, but in the past, she was a flashy girl and a playboy who had many sex friends. Ayaka had developed an anus in the past and was absorbed in anal sex, but she was completely unaware of this, of course Shigeo. She now aims to live a serious life with her boyfriend and has written off her past as a thing of the past, but in the midst of all this, she breaks her leg and ends up spraining it.