Reiji is a high school student who lives with his cram teacher, Hirokazu, after his mother's death. The object of his affection is the new teacher, Kurahashi Kyoko. One evening, Kyoko visits Reiji's house and is surprised to meet his father, Hirokazu. Hirokazu was Kyoko's tutor in middle school and her first love. Kyoko has a relationship with Hirokazu but in the student guidance room after school, Reiji steals a kiss from her lips...