Cheerful and charming Nanami is the idol of her workplace, but behind her constant smile lies a private struggle. She desperately wants to repair her cold marriage, yet months of trying to win back her husband have changed nothing, leaving her increasingly depressed. Her coworker Kurokawa cannot bear to see her looking so lonely and finally asks her to go out for a change of pace. That brave invitation changes both their lives, leading him to bring Nanami home, have sex with her, and cum inside her.