After finishing their housework, Kiriko and Tomomi relaxed in the living room, sipping tea and chatting casually. That's when Kiriko's son, Toshiyoshi, returned home. Tomomi began lavishing praise on Toshiyoshi, gazing at him as if infatuated, but behind her admiration lurked lewd and twisted desires. Sensing Tomomi's true intentions, Kiriko agreed to let her son be used for Tomomi's pleasure. In exchange, Kiriko would become deeply involved with Tomomi's husband, Ryota. The story unfolds within the household, weaving a complex web of relationships entangled with hidden lust and desire.