Novel info
In Harry Potter World As Madara Uchiha

A regular man dies from a heart attack and wakes up in an unfamiliar forest. Panicked, he sees his reflection in a nearby pond and realizes he’s not himself anymore. He discovers he’s been reincarnated into the world of Harry Potter—in the body of Madara Uchiha. A mysterious floating panel reveals this shocking truth. Now, with Madara’s power and a world of magic to explore