Waka and Tsugumi are cousins. Each other promises to marry the boyfriend who has been dating since school days. One day, I went on a hot spring trip with my boyfriends to commemorate my engagement. 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. Unaware of this, the two couples visit and end up in hell where they exchange fiances and have a vaginal cum shot swap...
