The Nishino couple moved to a larger apartment, thinking about trying to conceive and the future. Their neighbors are nice and tell them a lot about the neighborhood. If there's one thing they're not happy about, it's sex with her husband. She's not satisfied with her husband because he finishes so quickly, so she relieves her stress by masturbating. One day, her neighbor tells her that she can hear her voice, and she thinks he's going to tell her off, but...