Yuko Kawaguchi is waiting for her ex-husband who is coming out on parole. She divorced and removed her registration when he was imprisoned, but her heart still belongs to her husband, Hasegawa. However, five years of being single weighs heavily on the naturally promiscuous woman, and once a month, she requests erotic massages. 'I swear I won't let him penetrate me,' yet when she gets aroused, she ends up taking in his thing anyway. And on the day her ex-husband, Koichi, is returning, Yuko's younger brother, Masao, was also heading to her house.
