When Eriko was a student, she fell in love with her childhood friend, Kyo. However, on the day of their date, Kyo disappeared. After that, Eriko married Kyo's best friend, Takeshi. Eriko, Kyo, and Takeshi had a love triangle when they were students. And reunion for the first time in 20 years. The stopped gears of Kyo and Eriko started to move. Her feelings for her beloved husband have not changed, but she has not forgotten her feelings for Kyo. Tormented by a sense of guilt, the immoral love triangle begins again...