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Yui unnie, a childhood friend who is about to get married. The marriage partner is also an older brother who lives in the neighborhood who used to be like his real brother. They should be good friends, but I couldn't congratulate them from the bottom of my heart ... One day, my sister showed me a real face that I had never seen before. The appearance is incredibly nasty from the usual neat and clean Yui unnie ... "I'm going to marry that person, but do you have a lot of sex?"