Brand New Animal Michiru x male human reader x Nazuna

I got inspired by another guy that is doing a story of this anime so I thought it would be fun to do I've watched it and got hooked now you are a close friend of Michiru and Nazuna you three were as close as best friends can be then one day Nazuna suddenly turns into a beastman whish shocked you and Michiru but one day Nazuna disappeared you didn't know what happen due to being sick then Michiru was missing school you went to check up on her but what you saw changed your life.