Have you seen that movie? It’s German.
The premise is that this girl, Lola, is trying to get by with her boyfriend, but they’re short on cash. He decides to stage a robbery and dies. She relives the day over and over, trying to make sure he doesn’t die, and makes little changes each time. Color and imagery are used to signify the changes.
Now, keeping that in mind, I present to you the 4 days of Hibiya trying to save Hiyori.
Day 1 - The day she follows the cat and gets it
Day 2 - The day he tries to keep her from following the cat
Day 3 - The day he tries to bipass seeing the cat altogether
Day 4 - The day he follows the cat instead
The cool thing to do is to look for the choices and the changes.