>>126984
You and your team are stationed in a research outpost on one of the celestial bodies within the Solar System. The nature of your research is not known to the wider public and you are working for a secretive government research agency, big corporation with claims on this rock, some shadow cult masquerading as an international research agency, etc. Nobody you know, not even you, understands the nature of your work entirely, or the reason why you’re stuck in this seemingly unremarkable region, equipped with some of the most advanced tech humanity can offer. Until one day, you find a whole catacomb complex deep beneath the ground, full of ancient alien artifacts. They might or might not cause some light eerie feelings, usually dismissed as some psychological disorders, but one day somebody triggers the wrong artifact in a wrong way and that stony arch which everybody believed to be just a part of natural formations lights up and starts spewing dark miasma into the world. Everyone coming into contact with said miasma turns into either a sexy, yet monstrous and feral creature, as happens to most of your personnel who are women, or starts experiencing a bunch of weird and unexplainable effects. Things coming in contact with the strange miasma may transform into something completely different, or receive completely new and unexpected qualities.
After completing the first chapters, you might find out that that people you’re working for knew about this all along, and that they are either, directly or indirectly, responsible for causing this mess, or it was a welcome accident for them and now they’re pissed off at (You) for actually surviving, managing to shut some of the portals down, sending the big bad creature with white wings and red glowing eyes back into her world, and even destroying the artifact(s) responsible for creating the portal between the worlds. That’s where you find out that there are mentions of similar devices hidden somewhere back on Earth, and it’s only a matter of time before They find them and use them to open the portals to another world in the sky and cause a mamono invasion that would engulf the Earth. Bonus if the people you’ve been working for turn out to have been some lilim, danuki, or demons this whole time.