>>26326
> Natalie told the teacher that it was to be read IF she found herself "in trouble."
Well, the thing is that she didn't. She just said she had a note in her bag. She does add "I'll already be in the noose", but it's not said as an instruction to read the note at that moment, and instead as a statement of fact as if it's already somehow understood by all parties when the note is supposed to be read. Even if it were to be read as an instruction, the natural assumption is that "I'll already be in the noose" means "I'll already be hanging/hanged", not "I'll be standing on the stool with a noose on my neck waiting to be hanged". If I was this teacher, with the instructions provided it wouldn't have occurred to me to read the note before the hanging and not after. Also speaking about being the teacher, during the story you occasionally switch to first person - another thing typical in those 12yo ficwriters.
> the contents of the note were to give the teacher information for DURING her snuff/execution/culling
You know it as the writer. The teacher and the reader don't. Not until the note is actually read, which then leaves the reader confused how the teacher knew that prior to reading it.

> in practically every movie out there, and many books, that have a different world than ours
Having a different world than ours is indeed found in every other book and movie (funny how you mention movies first and books as an afterthought). Having "a virus change humanity to make too much girls be born and contraception not effective so now we have to cull them" is not. It's probably the most cringe type of worldbuilding ever, rivaled only by "the school system has officially designated Alphas and Betas".

> Most of that is done as part of the story, but in a short work it's harder to do that
That's not the problem. If Harry Potter had a preface explaining "This story is set in a world where magic actually exists, mages hide themselves from non-mages and have hidden magical schools" and so on, it would've been not so fun to read, but still would have worked. If instead it had "centuries ago a virus changed humanity by introducing magic"... well, note how it doesn't do that. Neither does Edward Hyde's Sydneyverse have a virus make everyone accepting of girlmeat. Similarly NoPantsRelationship's Club Meat Grinder doesn't have a virus turn humanity into sadomasochistic furries. And even my own stories known for "having no explanation" actually have things like Len having a whole train of thought getting him from fearing death to how it means they should kill themselves ASAP (in Die Young) or the twins misunderstanding the word "taboo" to mean "a fun way to have sex" and from that decide to try out necrophilia (in Taboo), and never once does it go: somehow, Palpatine... I mean: somehow, a virus made the twins want to kill themselves.

You're basically unironically using "a wizard did it" as an explanation within a story, only with a virus to stand it for the wizard. "A wizard did it" is something you say to readers demanding explanations to establish that things are the way they are because that's how they are, because it's a different world and things are this way in it, because you have artistic license to have things in your world be your way. But it's not something you unironically base your worldbuilding on. The problem with your "explanation" is that you're unironically trying to pass an explicit non-explanation for a proper explanation.

Again, the core of your story with the hangman game and the hanging itself is solid, and things like that I would indeed enjoy to read more from you. But then there's "somehow, a virus changed humanity forever"...