Nanami maintains a facade of a blissful marriage with Shuichi, but she harbors dark secrets about her past enslavement by a man named Kamata. Though she was rescued by Hino-kun, she has entered into a guilt-ridden affair with him as a form of repayment for his help. As their fourth wedding anniversary arrives, Nanami struggles with the weight of her betrayals while celebrating a pregnancy she hopes will secure her future with her husband.