From Cave Scanlations:
Using dangerous forbidden magic called “Fantasy Day”, Last, the Blood Clan’s leader, wants to help his daughter Lilo Ai realize her dream as a vampire. Even though she needs to depend on this magic her father is using, she can at least move about freely during the day, attend school and form friendships with Chong Yin and Fei Hu. Should her identity be discovered though, the magic will lose its power and her father’s efforts will be for naught or worse. However recently, a number of girls have dropped out or transferred away from school because they said they were attacked by a “School Campus Vampire”…

Includes a prequel oneshot:
From JShoujo Scans:
"By writing your wishes on a black piece of paper and writing 666 on the back, you're able to gain immortality from the vampires"

Last and Lilo are the one of the few vampires left standing in their family. With the faithful servant, Selly, they wanted someone new in their family. However, Lilo's choice doesn't seem to be in agreement with Last, the leader of the family. Hence, Lilo tries to make decisions on her own...