Twenty years ago, his father evaporated, and Hitomi and Kyota lived together. Kyota wanted to protect his mother as a man, so he graduated from school and worked hard to find a job. Hitomi also thought, "Kyota will leave me eventually...", the loneliness in Hitomi's heart grew. "I hope you don't go anywhere. I want you to be by my side all the time." An emotion sprouted in the crevices of my heart. It was a forbidden emotion similar to Kyota....... The two of them embark on a hot spring trip.