I Only Want to Lie Flat While Placating the Gods

People from other worlds are often summoned to the continent of Gedamia.

But they aren't "heroes": they're "demons"!

The unknowable Outer Gods lurking beyond the world are playing a game.

Now five hundred people have arrived. What could the Outer Gods be planning?

Is this a battle royale with five hundred people in another world? A story about fate.