A classmate reunion leads to an affair; missing the last train, she finds herself alone with her former crush, her mentor. She licks his entire body with insatiable desire, engaging in a one-night-long, immoral sexual encounter. (Natsume Ayaka RBK-133)

Ayaka lives a peaceful and ordinary life with her gentle husband and adorable son. However, their relationship has gradually devolved into that of mere "family," and she is no longer seen as a woman by her husband. Just then, she receives a notice of a class reunion. Ayaka reunites with her high school crush, her mentor, Kida, after 20 years. That unrequited first love, and that unforgettable gaze, rekindle their connection. Although her mentor is slightly older, time seems to flow again when she faces him, unchanged from years ago… No longer teacher and student, the two are gradually drawn together by an irresistible affection.