The only One here

Demons, evil spirits, yokais, or whatever you call them. Humanity's number one enemy. For hundreds of years, people were terrorised by the entities. And for hundreds of years, humanity fought back. People with powers arose and protected the weak. The heroes are led by one, the strongest, the alpha and omega, the One. The prophecy says that the power of One is the strongest, and therefore, they're bound to be alone. There can only be one. Or else the shadows will rise.