Grim

A certain soul that travels within the other dimension. It is awaken as a young man who has no memory within the ruins, it happen that he was in the middle of the battlefield between the monster and human. He helps the wounded soldier who almost eaten by the monster when he touched the huge weapon that the soldier has easier to wield. He was invaded by the weapon and lose the consciousness, he wakes up he saw a mountain of corpse of the monsters.