白妙様、秘密ですよ

Shirotae-sama, Himitsu desu yo

Utao Hananoi hides that she is actually a human, even though she goes to a vampire highschool. One day she is found out by the vampire progenitor Shirotae. In a world where humans are food, Utao and Shirotae find themselves oddly drawn to each other. (Source: Comic Boost, translated)