Daniel "Danny" Matthews, brought to another world at 13 years old, and was trained for five years, becoming the best hero the fantastic alternate fantasy world or Rathia has ever seen.

Having an unmatched ability to learn skills and progress, several times more talented and skillful than the fantasy world of Rathia has ever seen, he became the ultimate hero, far exceeding those before him

However, as if in response to his existence, the Demon Lord that he was summoned to kill also turned out to be more powerful than ever

The seemingly endless game of Demon Lord, and summoned hero that happened generation after generation was brought to a climax by the most powerful Hero to fight the most powerful Demon Lord, thereby destroying the world of Rathia as they knew it

However, unlike the previous bouts where the hero and Demon Lords killed each other in mutual destruction, this time Daniel survived, and witnessed the destruction of Rathia

Looking at a ruined world, he suddenly found himself sent back to Earth, 5 years after he went to Rathia, to an Earth he no longer belonged to.

Somehow retaining all his Hero abilities, but none of his weapons or clothes, he became a magnet of even more such summons to other worlds