Rosario+Vampire(2004)

All-around average student Tsukune can't get accepted to any high school save one...but on his first day, he finds the rest of the student body doesn't appear average in the least. Best of all, the cutest girl on campus can't wait to fling her arms around his neck! Wait a sec'--are those her teeth around his neck too...? Tsukune's going to have one heck of a hickey when he gets home from Monster High! But does he have a chance in H-E-double-hockey-sticks of raising his grades at a school where the turf war isn't between the jocks and the nerds but the vampires and the werewolves?

(Source: VIZ Media)