Since losing his father at a young age, Masaki and Ayaka have been living together. Masaki came to love Ayaka, who loved him dearly, more than just as a mother. Soon after graduating from university, Masaki found a job, but the workplace was in Kansai. Not wanting to leave his mother, Masaki received an invitation from Ayaka for a hot spring trip. Masaki decided to confess his feelings during this trip.
