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My name is Ryoichi. 22 years old in the 4th year of college. One day, I suddenly decided to live together with my sister-in-law, Hail, for 10 days. But actually, I have a bitter feeling with my sister-in-law. When I was a student, when I was a senior and junior in the track and field club at the same school, I confessed that I fell in love with my sister-in-law. There was such a thing, but ... I'm going to live with a woman I've come to like once ... I can't stand it ...!