Waka and Tsugumi are cousins. - Both of them have promised to marry their boyfriends, whom they have been dating since their student days. - One day, I went on a hot spring trip with my boyfriends to commemorate our engagement. - However, the inn they head to is a scary place where the owner has run away due to poor management, and a yakuza is staying there to prevent it from being auctioned off. - Two couples who visit without knowing this end up being condemned to hell, where they are forced to exchange each other's fiancées and have a creampie swap...
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