Human scum and Monster Fun

Mc and his school is isekaied into a monster forest. They have to survive on their own with no instructions. Some have cheat abilities while others don't know what their abilities are. After some of the students perform a coup and kill the other students, our MC barely gets away. Gravely injured, he runs into a slime.
Monster harem is a bit much. Also gets pretty dark with all the death and betrayal

Not a monster tamer but has to suffer from betrayal