Rei and Tetsugaku were childhood friends and have remained a loving couple through five years of marriage. But that summer, she discovers his affair. Their failed attempts to have a child leave her devastated. When Tetsugaku’s father Dango stays over during a business trip to Tokyo, Rei reunites with the man who always treated her kindly back home and finds herself increasingly drawn to him. Realizing that she has begun subtly tempting him, she finally makes up her mind and heads to Dango’s home...