Sister-in-Law Spied On Shiho Sakura

Every year, her husband returns to his family home for the opening day of the ayu fishing season. She usually doesn't go, but this year she decided to tag along. At the family home are her father-in-law and brother-in-law. But the father-in-law is on a two-night, three-day hot spring trip with his union. The brother-in-law, single and starved for women, sees his sister-in-law taking a bath...