Kamitsuki Gakuen

The story is Shizuka’s awakening to life as a vampire, while she befriends classmates and fellow Epicureans, and tries to befriend Ichi-gou. Shizuka, on account of never feeding directly from a person is runty, and her bat wings are little, but with help she learns to find the idea of sucking Ichi-gou’s blood alluring.
(Source: Okazu)