It Shows on Your Face, Ichijou-San

Mahiro likes to admire Ichijou-san from afar. She is the most popular girl in class and comes from a very prestigious family. Despite all this, Ichijou-san treats everybody nicely and is equally kind to everyone. But she harbors a secret that Mahiro unexpectedly discovered— she's a vampire! She claims she's not interested in human blood, though there appear to be moments when she's barely able to conceal her innermost desires... A bloodsucking, heart-throbbing love-comedy about a young lady vampire! (Source: Comic Meteor, translated)