After divorcing her husband, Luna raised Tatsuya single-handedly. After taking her father in, she quit her job and Tatsuya, who was a student, supported her livelihood with a part-time job. After graduating, he worked in a factory without further education. As for his father, in addition to being bedridden, he suffered from dementia and went on a rampage. Luna took Tatsuya on a journey. While she thinks that she wants to live their lives together again...
