Even though some of the blood-letting is definitely noticeable, such as Arthur Fleck's (Joaquin Phoenix) murder of talk show ...

This is an anthology movie, 4 unconnected short stories. Similar to the "Twilight Zone" movie but with time travel or some kind of time distortion as part of each plot. "Reset", "Momentum ...

Misora Haruki is also a high school student and she has the power to reset the world by 3 days. If they use both of their powers together, they can go back in time by 3 days and retain their memory.