I Use Ninjutsu at Hogwarts

In 1991 New York, a criminal deal unfolds on a dark Manhattan pier - until the lights go out and chaos strikes.
From the shadows, a mysterious boy attacks with strange "water-style" techniques, his movements swift and deadly. When the fighting ends, only silence and bodies remain.

The boy is Kyle Grindelwald, an orphan who secretly wields chakra - the mystical energy from another world. Reincarnated from a modern Earth, Kyle has spent five years mastering ninja arts beneath Brooklyn, building an underground base and surviving by robbing gangsters at night.

Unbeknownst to him, two figures watch from afar - Albus Dumbledore and Newt Scamander, who see in him both danger and promise. For Kyle carries not just the power of another world... but also the bloodline of the Dumbledore family.

Soon, Hogwarts will never be the same.