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A brother-in-law who came back to his parents' house after a long time on a train from Tokyo all the way. It's been a long time since I've seen my sister-in-law, Shiho Tachibana, and I'm fascinated by her exquisite beauty and sophisticated body. While spending time together, the brother-in-law gradually begins to be frustrated with his brother-in-law. And from the moment the older brother went out and was alone with the sister-in-law, the brother-in-law and the sister-in-law finally became one.