Maid-san wa Kyuuketsuki

Fifteen-year-old Alfred Sainoji, the heir to the prestigious Sainoji family, spends his days becoming the perfect gentleman. His only solace from the strict lifestyle his family expects of him is his maid, Magly. However, this cool and collected maid has a secret—not only is she a vampire, she's a naughty vampire.

(Source: Yen Press)