Yuzuki and Tsubomi are cousins. They have both been dating their respective boyfriends since their student days and have made a promise to marry them. One day, to commemorate their engagements, they went on a hot spring trip together with their boyfriends. However, the inn they arrived at was a terrifying place where the owner had fled due to financial difficulties, and yakuza were squatting there to prevent it from being auctioned off. Unaware of this, the two couples were forced into a hellish situation where they had to exchange and perform unprotected swaps with each other's fiancés.
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