Shortly after moving, Kawamata was in the veranda and a piece of paper fell from the sky. There were those words "I like you," "Sensei" written on it. And then I heard a dying-like cry. Kawamata got to know that the voice belongs to the Senpai from his part-time job. From then on, he can't take his eyes off Kosuge anymore. On such a day, a person appeared who Kosuge would call "Sensei"...