Takashi Shiratori, who came to Tokyo with the goal of becoming a picture book writer, decided to stay in Narutakiso, an apartment owned by Hatoko's high school girl Kozue Aoba. Takashi is deeply moved by the treetops that greet him with a smile and support his dream of becoming a picture book writer. A college student, Momono Megumi, a resident of Narutakiso, approaches him. Megumi, who investigated Takashi's identity, says, "There is a secret in the top of the tree."