Shirotae-sama, Himitsu desu yo

Utao Hananoi attends an elite academy with one unusual admission requirement: its students are vampires. Being human, she has to hide what she is, since her kind still counts as a meal to the creatures around her. Her cover holds until Shirotae, the vampire progenitor himself, sees straight through it, then offers to keep quiet about it for the time being. Whether Utao can hold on to both her secret and her life depends on what Shirotae is really after.