Kämpfer

From the introduction:

Welcome to Earth! Wait, you’ve been here before? Really? It does look similar to the world you are familiar with except for a key difference. There is a war in the shadows between two factions, Red and Blue. The stakes are high as death means erasure from the minds of everyone you know. What is the prize? There is none! Nope! These poor saps are conscripted into this battle without a word and expected to fight. What will you do? Will you try to stay on the fringe and avoid fighting? Will you choose a side? Maybe you want to try uniting the factions? Whatever you decide it won’t be easy. Feel free to take these Choice Points and good luck!