Saki Kanzaki, a high school teacher, came to a certain hot spring inn with her friend Kanori Nomura. Saki was in an adulterous relationship with Seiji Funabashi, the young proprietor of the inn, and had come to see him. However, Seiji tells her they are breaking up. Heartbroken, Saki goes out with Kanori to pick up men. Meanwhile, staying at the inn is the erotic novelist Shundei Fukiya. Shundei was formerly a teacher, but lost his job due to an affair with a student. That student was Saki, and the two are reunited…

Sayaka has been married to Shuji for seven years. One day, she happens to meet Takashi, who she dated before they were married. Since then, Sayaka has visited him almost every day. That day, while they were having sex, his wife comes to clean the room. Sayaka takes the opportunity to leave the room. The next day, she calls Naomi, a friend from her school days, and confesses about her sexless relationship with Shuji and her affair with Takashi. Sayaka's heart is shaken, and she unconsciously heads to Takashi's room.