It’s a Secret, Shirotae-sama

Utao Hananoi is a student at a prestigious academy—that’s meant for vampires! As a human, she must keep her identity a secret as humans are still considered food for the supernatural beings. But despite her best attempts, her secret is discovered by Shirotae… the progenitor of vampires! Thankfully, Shirotae offers to keep Utao’s secret, for now. Will Utao be able to keep her secret and her life or does Shirotae have other ideas in mind? (Seven Seas)