What would you do if you were transported to a different world to fight the monster? Would you die for people in a world you never know?

This is a story about a fantasy world which you need to fight the monster since you are summoned as a hero. This story starts as a simple fantasy game-like manga but it gets intense when we realize that the worst/ugliest creature in this world is not the monster but human themselves.

Betrayed by everyone in the world he has never been, the MC starts his journey with Demi-human and monsters. At least, they won't cheat him as certain someone.