After he got stabbed on his back he was reincarnated to an unfamiliar world in an unfamiliar room next to an unfamiliar girl.
He found out later on that he was reincarnated to a boy who has the same name as him, Erein Grid.
The vast world of Phantasia is waiting for him to be ventured. In a world where there is a famous occupation called Kynigos, that hunts the various kinds of monsters present.
Mythical creatures, demons, monsters and other beings.
Erein, who was reincarnated in this world was gifted with a remarkable system that will help him to be the strongest Kynigos.