In this world, there exist beings called blood knights - they are not vampires as humans recognize them, but "heroes" who were once regarded as saviors.
Initially, the Blood Riders relied on their extraordinary strength to protect humans and resist unknown threats, allowing people to praise their merits in peace and regard them as protection given by the gods.
But this peace did not last long. Strange disappearances and mutilated corpses appeared one after another, making humans gradually realize that something was wrong: these "heroes" were actually monsters that relied on human flesh and blood.
In the eyes of the Blood Riders, humans are just livestock to be slaughtered, with no power to resist. The so-called "protection" is just to make it easier to plunder food.
What is even more frightening is that when the blood knight has not transformed, his body is almost exactly the same as that of humans - warm skin, natural demeanor, and he can even live and communicate like ordinary people, and there is no way to tell them apart.
This kind of threat lurking around has plunged the whole world into a panic where everyone is in danger, and the once worship has completely turned into deep-seated fear and hatred.
In order to survive, humans established an official hunting organization - Blood Hunt. It is a fan work by the author who combines Kamen Rider and Ghoul.