Three years ago, while Satoru was job hunting, he lived with his uncle and aunt. During that time, he indirectly witnessed his aunt Chisa masturbating, leaving him tormented by impure feelings. He also grew increasingly obsessed with romantic fantasies involving his friend Seigo, often imagining intimate moments between the three of them. One night, Chisa, overwhelmed by stress from her divorce mediation, confessed she had turned to online dating for comfort. Hearing this, Satoru finally opened up about his own feelings. Overcome by irresistible desire, the two gave in completely, losing themselves in intense, passionate sex.