World Level Hunter

One day a high school student and his class are summoned to another world upon arriving they are told they are the so-called "heroes" but are immediately sold as slaves towards other countries but one gets a useless class and is tricked and thrown into a portal to one of the most deadly places on the planet over time he scavenges a little but do to the immensely powerful monsters he never manages to get food as time goes by he gets hungrier and hungrier so enough it gets so severe that he will eat anything due to gaining immense fatigue he is attacked the monster has managed to break both his legs but left after he managed to find cover and hide for a day soon he crawls to a nearby cave that smells of an unknown meat he has never eaten and chows down.