More Spoilery Thoughts
Kazuko’s power is weird.
So in previous time leap, it seemed to be the case that she threw her consciousness back into her previous body. Which isn’t an uncommon way to handle this kind of thing. She woke up a day prior, in her bed, in her PJs - by all indications, it was just her consciousness that went back.
Now, her whole body has gone back, clothes and all… except her notes - that she’s still carrying - have been erased from her notebook, and her original body is gone from the timeline as well.
Whaaaat? This makes no sense, UNLESS we’re about to find out that on this night she just jumped back to, she was sleepwalking in full school garb with her bookbag and everything, and it is just her consciousness that went back again.
Which is possible and would be an interesting twist and I hope is where this is going, because… why was she doing that?