How to write a mystery time loop story

[Zenomew]

The basic Idea is that in a class of 30 students a student dies once in every four days all except that one girl who is the MC's girlfriend

Each time the MC dies he is sent back to the first day except each time the rewind occurs the world becomes more darker


The deaths are getting more violent. the janitor is frequently seen cleaning up blood.classes are shuffled and new kids and alternate family members exist (in one loop MC has a twin sister in another he is is a girl ) Kids are walking around with aimlessly and strange faceless students are trying to kill everyone while adults seem to be missing or uncaring... strangely enough despite only his class remains the same excluding the occasional once in a while gender-bend

 

[Plantorsomething]

What’s the question you’re asking? This sounds great. If you mean general story structure, there’s your classics like red herrings and chekov guns and stuff, but idk, you’d have to go to youtube

 

[Zenomew]

What’s the question you’re asking? This sounds great. If you mean general story structure, there’s your classics like red herrings and chekov guns and stuff, but idk, you’d have to go to youtube

A time loop story with a mystery killer who seems to have a grudge against the MC's class going as far as to turn the whole town into a hellish place filled with monsters

 

[Plantorsomething]

A time loop story with a mystery killer who seems to have a grudge against the MC's class going as far as to turn the whole town into a hellish place filled with monsters

Are you just asking how to write a story like this in general? I mean I don’t know much but I’d guess most of the job is making the audience question things along with MC, and leading them to wrong conclusions by presenting the story in a certain way, while still having the clues add up and make sense in the end. A technique I’ve seen done before is double-fooling your audience where they think X is a red herring and they’re obviously going to go with Y, but in reality it was Z all along. As long as Z isn’t an asspull.
So you’re making MC point toward X while the narrative feels like it’s hiding Y, and the audience, if they’re putting thought to it, will think Y is true because the story focus is actively trying to obscure that possibility (humans like looking at things that they think someone is hiding from them, like a suspicious man holding something (a knife/gun presumably) behind their back but the real suprise is behind yourself).