I married into the Thong Village - Yayoi Yanagida, An Mizuki - TARD-010

The couple, Mizuki and her husband, married after a workplace romance. To their astonishment, upon arriving at her husband's hometown, they were shocked to see his sister-in-law wearing a thong! To their further surprise, they discovered that her husband had also started wearing thongs. It turned out that the family's ancestral rule was that all family members must wear thongs on their lower bodies…