Aight. So. Just found this exists. Read the first chapter: Aight, cool, time loops game logic john wick and kingsmen references yada yada, got it.

Then I read the second chapter.

I disagree with timeloops, and the school subtly shows that it's that the 9th stage mentioned.

She seems to be controlling those giant bullets so I guess she nuked the school

I wouldn't say she's controlling them. First chapter she had a watch that was counting down, just so happened to be mindnight, but when it ticked over the bullet appeared. The stages seem to have a time limit, as I see it.

I'm a bit skeptical, only because I can't find a source that says anything, about a double amputee being able to stand or walk with prostheses that mimic real legs. A lot of our balance is controlled in minute changes in our feet.