After leaving her teaching position and becoming a married woman, 'Sayo' and 'Yoshino,' who graduated and worked as a full-fledged salaryman at a major trading company. The two had once been in a teacher-student relationship but had committed a one-time mistake. Then, 12 years later... they reunite at an alumni gathering. Sayo cannot hide her agitation, and memories of the past resurface involuntarily, causing her to start noticing Yoshino as a man. Since then, no longer as
