A lustful wife with a stronger sexual desire than anyone else, Saki Okuda, who can't even have sex with her husband's brother at night because she's in a thin-walled house with her husband's brother, and instead makes a move on her brother-in-law's dick.

The movie revolves around the complex relationships and desires within a household where a married couple lives with the husband's brother. The wife, Saki, has a stronger sexual desire than her partner, leading to a central dramatic tension involving unmet needs and potential infidelity. As the story unfolds, boundaries are tested, and secrets are revealed, highlighting the challenges of maintaining intimacy and honesty in relationships.