What if there was an anime movie where someone is stuck reliving the same day over and over again. However, each day is a different genre. Comedy, Drama, fantasy, mech, you name it, each with their own art style.
It eventually gets revealed that the person is reliving the same day over and over again because there’s a tsundere who has a crush on him who cannot confess her feelings to him. She knew the next day at school he was going to confess to his crush, so in order to stop this she put the world in an infinite timeloop until she becomes his crush.
In the end, the guy would be able to convince her that even though she’s scared and afraid of possibly being hurt, there are people out there who care about her. She is not alone, and never will be. They end up becoming friends and he ends up moving on as well after his crush turns him down.