a world where any disease, mental or physical is a parasite, and the more they stay on your brain, the more they can evolve, So it starts with a minor defect, but then the more it stays it whispers into your ears, and in that way, it can evolve, and eventually kill you with either your own actions or it can kill you itself. 14 year old Valkrie suffers to take care of her parents who have the parasites Suicide and Anorexia. After the parasites evolved to the ability of taking over the full mind, people are turned against eachother
I hope you guys enjoy this book I wrote, feel free to write a story with diseases like this if you want to but I didn't use any copyright for this I just used my imagination and came up with this.