Hiiro ouji manga

Hiiro Ouji summary:

From Nevermore Scans: In order to capture the vampire lurking in the school, Mana the exorcist transfers in. Okamoto-kun, the vampire in question, is one who has changed with the times and gets by on blood transfusions! Mana is left dumbfounded by the carefree, easy-going vampire! An eagerly anticipated romantic (!?) school comedy released by a new author at Sylph. ?