Tasuketsu -Fate of the Majority- Episode 1 English Subbed

The story is led by five people in a world where people started to go missing and a rumor spread they died. A mysterious personality gathers five people together with great mindsets and then orders them to solve this. They realized that there was a game behind all this and they participated in it. After that, they knew the rules of the game which is to kill as much as they can humans.