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Half a year ago, my wife and I had a quarrel over trivial matters, and as a result, my wife returned to her parents' house. After that, I lived a solitary life in a house that was a little too big for me to live alone. Rena Wakao, a beautiful kimono-clad sister-in-law, came all the way from her hometown without contacting me, probably because she was worried about the situation where she was too tired to wake up in the morning.