Hikari Takabayashi is a hardworking call center agent for a home appliance company who apologizes continuously to customers, even to rude callers who call just to verbally insult her. She does, however, hide a secret. A love affair with her married boss. One day she was asked by one of her junior colleagues Mika, to take a call from a middle-aged woman named Kazuyo Miyawaki who calls frequently. Upon returning home exhausted after dealing with the caller, she noticed the nameplate on her neighbor's door, "Kazuyo Miyawaki".