[Reducing Mosaic]START-611 Swapping perverted village. The place she married into was a twisted hamlet where they swap wives for fun.

Haru Shibazaki moved to her husband's hometown, a cold village, several months after their marriage due to her mother-in-law's poor health. Despite being confused by the unique rules of the village, Haru tried to adapt. However, during the celebration party for their move, she was attacked by her husband's senior couple. From that point on, Haru learned about the terrifying 'obscene custom' that had been passed down in the village for generations—.