My husband doesn't know - my lewd desires and secrets

Hirai's wife, who lives downstairs in the apartment complex, runs away from home, and Hirai visits the Isshiki family to see if he has any idea. Hirai, who vents her anxiety, is unable to contain her feelings of loneliness without her wife and Momoko's kindness, and pushes her down. Momoko's body, which hadn't happened to her husband for a while, is quickly swallowed by Hirai, who is raping her as she instincts... The pleasure she hadn't experienced in a long time created a hidden desire within her. Before long, Momoko began to seek Hirai's body by herself...