Once upon a time, there was a poor abandoned black kitten. It was so weak and hungry that it could no longer stand. On the threshold of death, a vampire came across the kitten and took pity upon it. While gently holding the kitten, the vampire gave the kitten his blood, and the kitten changed. It grew fangs, a pair of wings, and developed a thirst for blood. Thus this cat became Nyanpire! Nyanpire is then adopted by a human girl, and leads a fun life as a house-cat.

Based on Yukiusa's 'The Gothic World of Nyanpire' doujinshi.