The short answer is: it's extremely unlikely. No fossil records of megalodon extend beyond 2.6 million years ago. Our full article on megalodon breaks down all the theories for the species' extinction, but the bottom line is there is overwhelming evidence none have existed in the past million years.

Does the demon shark still exist?

Sightings of this creature are rare, and no physical evidence has been found to prove the creatures existence. So, few people have reported that they have seen this huge Black Demon, but there are no proofs or evidences of it.

What is a shark demon?

The Shark Demons were two huge sharks under the command of Shiranui and one of the twelve demons that made contact with Daigo Kagemitsu. The Sharks have been revealed to be Jiromaru and Saburomaru, which have been presumed to be siblings.