Think of a kingdom that is peaceful and balanced (the body bein all happy and healthy). Now, think of it being tormented by foreign invaders, a massive heat wave (fever) and spontaneous fires (inflammation? lol)

One girl flutters down from the heavens (lol she's gonna represent a virus or something, so she's one of these invaders. There would be many of them but this gives a character focal point?). There are bird creatures that try and stop her from reaching the ground (enzymes, maybe?), but they fail to do that.
The girl lands in the center of the kingdom, in a ring of some sort of round structure. Idk, stonehenge type of thing, lets just imagine that for atmosphere lol.

When she comes to, she finds that this world is very uncomfortable by the heat, like, unbearably so. It would kill her if she was weak enough. Before she could figure out much of where she is, she could be met with some beastly figures (phagocytes) who try to eat her.
Another character calls out. Someone who looks similarly to herself, another virus. They flee together and this character protects her. They explain the situation, giving the character and the reader an idea of what is going on. Only to be gobbled up by a Neutrophil--a beast which self destructs after consuming its victim.

The girl escapes again and continues on, but is being stalked by another character (A Natural Killer Cell). She doesn't catch onto this until later, but maybe this would turn into a final showdown situation where either this assassin kills the virus, or the virus wins and the kingdom falls.

Somehow I want to express the mindset of the virus characters. There are many of them "infecting" or invading the kingdom, but they aren't doing so intentionally. They're confused when they arrive, have no knowledge where they come from, but if they survive long enough they come to realize that their existence is tormenting this world and causing it to fall apart.
So they either die or this world suffers/dies.
I'm great at positive stories, aren't I lol

Maybe for something less depressing, the viruses find a way to return to the heavens and everyone lives. Except for if you know enough about a virus, once it leaves the body it either infects someone else (thus repeating the characters' torturous lives) or they die after a certain time lmao

I like your idea for the fire. Like there's a more direct and accidental cause. My idea was that the atmosphere itself changes when a virus appears. Much like when it gets too hot irl, it often starts to rain to cool it down. In this little universe, the weather is pretty much like OHSHITBADPEOPLE -shoves the sun closer- XD because the heat of a fever/inflammation is meant to stop an infection too
If I were to get more in depth about it, though, I'd definitely have other types of cells or whatever it is that causes inflammation, to be the ones shifting this atmosphere in a fit of panic or something?

I decided to get rid of the structure idea. It was meant to be something but I realized that I was thinking of the lymphatic system, which wasn't going to be chronologically accurate. So she just slips past the enzymes and is simply "in the system"


I planned for the viruses to all be the same type. Not sure how well it makes sense scientifically, haha
The virus that helps Veira is not a scientific reason, just an action to help me from a story and explain that Veira isn't the only (or first) one of her kind. I guess I might be taking a little creative freedom with having other virus characters, I hope that doesn't end up ruining things. They do serve a purpose in helping me tell the story in a faster manner.