Un Vampire de l'Obeissance

Lucrezia is a vampire from outside of Japan. She is only in the are to seek the "Supreme Blood." But that blood is in a workaholic girl who can only thing about making enough expenses to help her family out. But when they meet and a brawl breaks out with the help of a charm Lucrezia loses a majority of her powers and grows younger. So now to recover her power and have the supreme blood, Lucrezia must work to earn that blood. But what how will someone who doesn't know a lot of worldly knowledge and does things on her own do?