Toshiki's nephew, Toshiki, is forced to stay at his apartment with his aunt, Sayuri, who has suddenly moved to Tokyo from the countryside, and begins cleaning the room in a hurry. Before I could finish cleaning, the doorbell rang and Sayuri arrived. Toshiki is surprised to see Sayuri's youthful appearance after meeting his girlfriend for the first time in a while. ``For the next three days, I'll be alone in a small apartment with such a beautiful aunt...'' I was thinking about that.