Makoto Sakurai, a dedicated homeroom teacher, conducts a home visit to help his struggling student, Miki Ayase, avoid failing the year. However, the visit takes an unexpected turn when both Miki and her seductive mother conspire to tempt him. Despite his professional resolve, Sakurai falls into a cycle of illicit encounters with the mother-daughter duo and another student, struggling to balance his professional ethics with his growing addiction to their forbidden desires.