Kyoko Yabuki and her husband moved to the countryside due to work. Though adjusting to their new environment was tough, life seemed fulfilling—until they encountered a thuggish neighbor in the next room who casually made unreasonable demands and caused constant noise disturbances. Driven by her strong sense of justice, Kyoko recklessly confronted the man, and the noise stopped immediately. Relieved, her husband Takashi let his guard down—until Kyoko began contacting him frequently with odd messages. Growing anxious, he left work early and returned home, only to hear suspicious sounds coming from the neighboring room. Peering inside, he discovered his wife secretly meeting with the man. Worse, he overheard her saying things that sounded like she was mocking and belittling him. Shattered and heartbroken, Takashi is left wondering how this nightmare will end.