Darken

Five years ago, monsters emerged from the void. They didn't just come—they simply appeared, like a disease.
Above them all stands one—King Darken. He's two meters tall, eight-armed, quite handsome, a veritable wardrobe. He can be anyone. He can take on human form, speak, smile—and then rip out their spines a minute later.
Darken used to be an ordinary man. Until one incident:
He worked as usual as a barista in a cafe, even though he was studying to be a lawyer, and made you coffee.
You are a monster, your fangs are sharp, your eyes are black as night and your speed is inhuman.
Darken caught your attention and after his shift, you bit him right at the entrance and turned him into a monster, not expecting at all that he would ascend and become King.
And now he's looking for you. The one who turned him into a monster. And he found you... in the cafe where you first met.