The new neighbor moving in next to Shionomiya's apartment is the alluring married woman Yuri and her husband. Since her husband frequently uses business trips as an excuse to be away, Yuri constantly suffers from sexual frustration. When she begins seducing Shionomiya, the two fall into a forbidden relationship. Taking advantage of her husband's absence, Yuri calls Shionomiya over and engages in intense sex within her room. However, by the time Shionomiya arrives, Yuri's other lover is already with her, and he witnesses their passionate affair firsthand. Contrary to her usual calm and gentle housewife demeanor, Yuri's lewd and seductive nature is fully exposed.