にゃんぱいあ The Animation S1

A poor little black kitten has been abandoned. It's so hungry that it can't even stand anymore. As one small life was about to perish, a vampire appeared from the darkness. The vampire gently picked up the kitten and gave it some of their own blood. The kitten suddenly began to change. It grew fangs and a pair of wings. This was the birth of Nyanpire.

"You've gained eternal life, but now you must live as a vampire forever. You'll have to find your own blood from now on."

Nyanpire was then taken in by a girl and her family and has been living a fun life as a house cat. But it still thirsts for blood...

"Give me-ow blood."