In exchange for a secret to her husband... ~A married woman who did what her neighbors say~

One day, Shinya, a man who lives in a certain apartment building, accidentally witnesses Saya, a married woman who lives next door, having an affair. "He seemed serious and pure, but bringing a man into his mind...it doesn't matter who you look at," Shinya puts this into consideration and puts it into practice, thinking of a despicable strategy to do what he wanted to do. He investigates the man she is cheating on and the company, and threatens that if he doesn't listen to what Saya says, it will cause trouble for the man...