Mei-Shun takes it nice to see a new month starts from Monday. November 2021 therefore has 5 beginnings of a week, seems a bit rare for shorter months with 30 days. It might not be a reason why Kaori-san chose this timing, while she saw one of her high-school friends just in front of 寿=Kotobuki Building, Kyoto which accommodates her 4th exhibition from Saturday.