A younger brother and his daughter-in-law (Rio) return to their parents' home where their dementia mother and older brother live due to a memorial service. My sister-in-law got tired of taking care of my mother half a year ago and my brother had a desire. On the other hand, the younger brother and his wife were on good terms but had a light sex life, and Rio sometimes acted to comfort herself. At that time, my younger brother returned to Tokyo for work. Rio was left alone to take care of his mother.
