A mage gets reincarnated after many years of floating around in limbo. Thank god, he's born in another world with magic as well. But eh? 

Why's the magic here so weak?

 Aren't I stuck here?

 Casting magic using wands.... What the hell kind of a low-level world is this?

He has been reincarnated in the world of Harry Potter. Watch... well rather read on as our protagonist, Sol Balor, influence the world of Harry Potter with no knowledge of it.

(The copyright for the world of Harry Potter and its characters belongs to J. K Rowling)