The Infinite Journey of the Ultimate Creature

A modern urban youth accidentally travels through a dungeon in another world and possesses a dying boy from another world. The boy's talent for magic appears. It is similar to the feudal country of ancient civilization. The world is unfair and people's hearts are sinister. He is captured by evil people and sold to the slave chamber. After learning about the terrible future of being used as a consumable, he struggles desperately. When he is about to die, the soul of a modern young man travels across the world. In order to escape the fate of being a consumable, he begins his journey to another world.