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 his childhood memories. - Atsushi is teased by Mizuki, who is amused by her innocent reaction, but that night, she happens to peep into the affair of her aunt and her husband. - The next morning, he asked Atsuya, who turned red when he remembered last night, "Did you see it yesterday?"