Tsuki no Kamiato

Following her late uncle's will, Amy visits his mansion to clean it up. There she meets a mysterious young man who calls himself Vincent. It turns out he's an "artificial vampire" born from her uncle's experiments! Amy is determined to turn Vincent back into a human, but living with a non-human isn't going to be easy...?! A girl-meets-vampire story!

(Source: Hakusensha, translated)

Note: The chapter count includes one extra.