Married for several years, Yuna, who is troubled by her relationship with her husband, attends her first class reunion in a long time. There she meets Ozawa, a teacher she admires... They exchange contact information and become close enough to each other to discuss her husband's troubles. One day, Yuna witnesses her husband and his lover walking happily together, and in a terrible state of exhaustion, she contacts Ozawa. Ozawa gently embraces the saddened Yuna, and despite feeling guilty, they share a kiss. Yuna responds by entwining her legs with his, pressing their sweaty bodies together...