After acnologia died, He woke up in a destroyed urban place where he met saitama.

Metal Knight's research into interdimensional portals leads to his discovery of Fiore, Crocus, and the Grand Magic Games. Ever eager to get his hands on new weapons technology, he volunteers a team for the Grand Magic Games...

After fighting against a monster, a dimensional rift sends Genos and Saitama in a parallel universe. Without a clue they arrive in Fiore, just to be found by Lucy, who has left the guild and strives the kingdom in search of strength. Will our favorite heroes find a way back to Earth or will they be stranded in a foreign world forever? REWRITE IN PROGRESS