I Hit Myself, Is It True or Not?

One day, the sky began to break. Different worlds begin to merge, and another you arrives. He may be the Archbishop of the Holy Religion in a fantasy world, a Duke Demon in the Abyss, or a Celestial Weapon Warrior in science fiction, etc. But no matter where he comes from, there can only be one you in the world. Let the battle begin! Fight against yourself, the existence of the loser is the world's recognition of you, and victory is the existence recognized by the cruel world. (The overlap between worlds causes the overlap of souls. Two identical souls are not recognized by the world. If one of them is not removed immediately, it will be erased by the world at the same time; the identical souls under the gaze of the world will definitely start fighting.)