Kyuuketsu! KuromajouBloodsucking! Black Magic Castle; 吸血! 黒魔城; Kyuuketsu! Kuromajou

Seventeen year old Aya is the perfect high school student. Good grades, popular and sports prodigy. She is looking forward to summer break as her pen pal has invited her to his family ranch, but one day on the way home from school she hears a voice calling her name from....