Komukai Manami, the housekeeper for the Ozawa family, has been having a secret affair with the master of the house for over a year. His son, Hiroyuki, knows about their relationship but silently watches from the shadows. One morning, Manami is summoned by the master for sex, unaware that Hiroyuki is observing from outside the room, stirring conflicted emotions within him. Later, Manami realizes her panties are missing and continues her chores without underwear. When Hiroyuki notices, he suddenly asks, "Why aren't you wearing any panties?" throwing Manami into further distress and escalating the tension between them.