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Rinko, a wife who lives with her husband's younger sister, Yu, who has been married for three years after working romance and has moved to Tokyo with the aim of becoming a cameraman. Yu was a little younger than Rinko and loved her like a real younger sister. One day, my husband decided to leave the house on a business trip for three days. Under one roof, there are only two sister-in-law. Normally, women should be able to live without worrying about each other, but there was a secret that no one could tell. Yu has been fond of Rinko since the day she first met ...