After the birth of their child, the couple's family life seemed stable, but their relationship had grown cold, falling into a sexless marriage. Desperate, the husband made the decision to call a delivery health service at a love hotel in Osaka. The woman who arrived was none other than Anri Namiki—his wife's younger sister, who had returned home while separated from her husband. Posing as a threat to her brother-in-law, she had come back with a hidden agenda. This love hotel soon turned into a living hell. The brother-in-law fell completely under his sister-in-law's control, unknowingly descending into the role of her sex slave. Entirely performed in Kansai dialect, this film delivers a shocking story where everyday life collides with raw desire.