I finally understand.
The present didn’t change for Kohtake, but she banned everyone from using her maiden name and changed her attitude towards Fusagi. She would be with Fusagi to continue being his wife, even though she had vanished from his memory. Hirai abandoned her successful bar to rejoin her family. While repairing her relationship with her parents, she was learning the traditional ways of the inn from square one.
The present doesn’t change.