Total Man Chi I Am The King Of Bloodsuckers

I am a scumbag, the king of Hell, the most powerful blood-sucking demon.

Suddenly one day, I discovered this world was a bit strange.
Primary school student death?
Tokyo Ghoul?
Hanma Yujiro?
Black Lagoon?
Haha, this world is more interesting than I imagined!
So in the end, we can find the meaning of living, or is there really someone who can completely destroy us?