The Sasayama household is an ordinary salaryman family, consisting of father, mother, and their son living together. One day, the son Takahiro's friend, Tomoya, comes over to visit. When Tomoya heads down the hallway to use the bathroom, he notices the door across from him is slightly open. Without really thinking, he glances inside—and is met with a shocking sight. There stands Takahiro's mother, Nozomi, wearing flashy, revealing lingerie. Tomoya is momentarily stunned, his eyes locked onto her. But instead of being angry or embarrassed, Nozomi begins to seductively lure him in. Tomoya tries to flee, flustered and nervous, yet he finds himself drawn in by her words. The atmosphere grows thick with tension and desire, rapidly transforming the relationship between the two.