Satoshi, who has come to Tokyo to attend university, goes to say hello to his neighbors... and what happens! - ! - The person who lived next door was my mother who passed away when I was little! - ! - The two are confused by their sudden reunion... However, the mother, Kiriko, uses this chance reunion as an opportunity to try to repair the relationship between parent and child, but the long gap cannot be easily bridged, and her son is Kiriko's. - Kiriko feels lonely because she doesn't call her mother, so what does she do?