based on:
unknown lifeforms
red dragon rising
and onkel willies Fatherland Timeline on the Alternate History Forums
You are a German General, marching to take the Demon Lord's capital of Royal Makai, and finally destroy the Mamano Untermensch!
Wait, you don't know why a german soldie- oh, wait, I forgot the explanation...
Your world diverged during World War Two, wherein this case Hitler proceeded to take Stalingrad and conquer everything up to the Urals. The end result was France (the German puppet) and Spain also declaring war on the Allies, which resulted in a negotiated peace. After the use of six different atomic bombs on Japan in order to end the war, and Chiang Kai-shek's Republic of China winning the Chinese Civil War, a new Cold War took shape. The tri-polar world was newly divided between the Republic of China, the Greater Germanic Reich, and the United States of America.
Each side attempted to gain their own advantage without risking nuclear war (all three sides had numerous ICBMs with orbital nuclear platforms). And when a quantum experiment in Germany went wrong, a new stage of the cold war began.
Due to the fact the Die Nebenwelt project had taken place where the boundaries between worlds were extremely weak, and that the Lilim of the other world had also attempted to open up their own gate in order to "make friends" with your world, the end result was immense portal storms opening up over Germany, China, and America, with Mamano expecting new husbands flooding through.
The result was disastrous. Given the Cold War climate, American fear, Chinese nationalism, and German ideology, the end result was the Mamano being pushed back into the portals, and expeditions being drawn up to invade and seize the resources of the primitive medieval planet on the other side.
Each side had its own world breaching programs- with the main portals being stabilized, you were sent into stabilize and "remove any threats" from the other world, with every nation doing the same. No one could simply let the other side have the resources of an entire planet, and so America invaded to create their protectorates, the Chinese to create their occupied zones, and you to create your Reichskommissariats.
And so, here you are, winning.
Wait, no, you aren't winning, you're doing a "tactical withdrawal". For all your advanced tech, your main strategy of dealing with Mamano armies was simply to launch a tactical 15 kiloton nuclear warhead towards them. However, when the Demon Lord came out of Royal Makai herself to meet a German IRBM heading towards her, she proceeded to absorb the energy produced by the explosion and then hurled it in the form of Demonic Energy back at your men.
Yeah, it may have been a bad idea to challenge the one who incapacitated the so called "Chief God".
You fled, back towards your military transport- except that Succubi had already gotten there, and were currently fucking your driver's brains out. You see a motorbike next to it though, so you could try to escape...
Looking back, you can see actual Lilim commanding brigades of Mamano, capturing many troops. One of the brigades (and Lilim too) seems to be heading towards you.
Well, shit.
WWYD?