Manga by author Aiou

Yeren, who dreams of being a vampire hunter, is unwittingly caught in the crossfire between a vampire girl and the Holy lands. As a temporary blood servant, he doesn't know what to do when the hatred and strife between them have been ongoing for thousands of years This is a story about LiloAi, the last vampire.

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 Loli 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, Loli's choice doesn't seem to be in agreement with Last, the leader of the family. Hence, Loli tries to make decisions on her own...