Before anyone could notice or even understand what had happened, the entire solar system got destroyed. A massive comet changed its course and ended up hitting the sun, causing a chain reaction that made our biggest star expand and then become a supernova. Five hundred seconds later, Earth started to get hotter, and in five seconds, all the life on the planet burned and died.

That was supposed to be the end of the human race, but for some reason, all the humans began to reincarnate as monsters in another world. Those who wanted to struggle and live for a while longer could fight and evolve, even reincarnate in other forms if they try hard... Billy was one of them, he wouldn't let himself being hunted without reason, and he was determined to climb up the food chain of that new world that had many fantasy races and monsters... but by doing so, will Billy be able to maintain his humanity or will he become a real monster?