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Atsuya went to visit her aunt Mizuki's house for the first time in a long time during the summer vacation. I can't look directly at Mizuki's lustrous body, which is different from my childhood memories. Atsushi is teased by Mizuki, who is amused by such an innocent reaction, but that night, he happens to peep into the affair of his aunt and his wife. The next morning, Mizuki asked Atsuya, who turned red when he remembered last night, "Did you see it yesterday?"