At the private Jiyū-no-Oka Gakuen boys' school, Eiko Onozuka was recently hired as a substitute for a math teacher on maternity leave...

Etsuko, an aspiring fairy tale writer, was on her way home after her manuscript was rejected by a publisher when she was molested by Koichi on the train. However, Koichi noticed that she was crying and was taken aback. Shocked, Etsuko jumped off the train and dropped her manuscript. Koichi picked it up, but was unable to forget about her, so a few days later he gave it to Etsuko, hiding his true identity. When Koichi praised her fairy tale, Etsuko began to think of him as her prince...

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.