The beautiful and renowned sisters, Nene and Nana. At the invitation of Nene, who is already married, and her husband Shinji, Nana and her fiancé Yukiyoshi came on a hot spring trip with them, making a total of four people. However, the inn they headed to was in financial distress, and the owner had fled during the night. Yakuza were occupying the property to prevent it from going into auction. Unaware of this, the two couples visited and were deceived and threatened, ultimately being forced to swap partners and perform a bareback swap, sending them spiraling into hell.
