Hellsing

From the introduction: It is the end of the 20th century and as they always have, strange things move in the darkness beyond the sight of mankind. Humanity is not alone in this world nor is it the apex predator it sees itself as. Monsters prey on us, demons that run the gamut from vampire to werewolf to stranger things still. Even humanity itself can sometimes become it’s own demon, our own sins and ambitions driving us to become worse than an inhuman being could ever hope to be. The humanity that sets us apart allows us to fall the furthest.