Isekai'd as a male monster. Also 2 other guys who stay human who aren't part of the main adventure and are the side story.

May 12 2087 was the world's end. Creatures that were only dreamed of are becoming real while the world is over run with all different types of monsters. Human existence is scarce, I lucked out finding what looks like an assault rifle in the back of a swat truck with enough rounds to survive. it wasn't until half a year later that the first sparked person showed up and fought back then the War between men and monsters happened. but before we get to that let's talk about the beginning of what seemed like the extinction of humanity