Shiho Sakura, who got divorced 10 years ago, raised Kota as a single woman. After graduating from university, Kota got a job, but it takes more than an hour to commute. Shiho advised him to live alone, but Kota refused to leave the house. On the contrary, he doesn't go out on his days off and doesn't bring his girlfriend or friends with him. Shiho became worried, and she invited Kota to a hot spring trip to take her outside once in a while.
