His nephew Takashi has decided to stay in his room for a few days with his aunt Yuko who came to Tokyo to participate in the training. Takashi's imagination, "Aunt Yuko, I'm sure she's old," was overturned as soon as she met again. Takashi can't hide his surprise when he sees Yuko, who is exactly the same as before. "I'm alone with such a beautiful aunt for four days ..." Even though I knew it was a bad thing, Takashi couldn't control his excitement ...