Ever since Masaaki lost his father when he was young, Ayaka and Masaaki have lived together. Masaaki came to love Ayaka, who loved him wholeheartedly, even more than her mother. After graduating from university, Masaaki got a job, but his place of work was in Kansai. Ayaka invites Masaaki, who doesn't want to leave her mother, to a hot spring trip. Masaaki decides to confess his feelings on this trip.
