Eri, a married woman living with her husband Keigo's family, is forced into a two-family household with her father-in-law, Atsuro. As a housewife, she handles all household duties for the first floor where Atsuro lives, including cleaning, cooking, and daily care. Though Atsuro pretended to be a quiet, elderly man before Eri moved in, he is in fact a notorious womanizer. He has developed a habit of peeking at Eri's panties on a daily basis. Unsatisfied with just that, Atsuro escalates his actions by planting hidden cameras to secretly record Eri and her husband in their bedroom. His increasingly bold behavior becomes a pivotal element that drives the story into deeper, more disturbing territory.