50 experienced people. - Ayumi Natsukawa, who has changed from her student days when she was uninhibited in sex, has become a member of society. I finally got married last year after dating a serious boyfriend who is the boss of the company for 7 years. I met a classmate from my college days in a local hot spring town that I came to as a one-year wedding anniversary trip. "I didn't want to see these guys again..." They were Yarisa friends to which Ayumi belonged. Ayumi vowed not to fall for them no matter what, and had a strong will to never lose herself, but her old memories gradually revived and she fell.