Vamp!?

Rio has lived at a convent with other girls since her parents died when she was very young. The girls live as well as they can, making secret trips at night out to the convenience store to get junk food. On one of these trips, Rio trips over a boy lying in the street. He doesn't want to go to the hospital so she sneaks him into the convent. When she wakes up that night to find him leaning over her bed, she is shocked to see he has fangs. But is he really a vampire?