Nana and Nana are sisters who are popular for their beauty. At the invitation of her sister Nene, who is already married, and her husband, Shinji, Nana and her fiancé, Kouki, came to a hot spring trip with a total of four people. However, the owner of the inn they headed to was running away at night due to poor management, and it was a terrifying property where the yakuza stayed to prevent it from being auctioned. The two couples who visited without knowing it were deceived and threatened, and eventually fell into hell where they exchanged each other's men and made a vaginal cum shot swap.
