16世纪,日本爆发应仁之乱,战火瞬时蔓延全国。国内征伐不断,百姓流离失所。是时妖魔邪祟趁虚而入,祸乱人间。吸血鬼在魔王鬼源真祖的率领下大肆屠害生灵,与之相对,另有一部分吸血鬼猎人挺身而出,与这群恶魔展开斗争,彼此缠斗近400年。 20世纪70年代,猎人集团以“红盾”的名义存在,他们中的少女猎人藤本小夜(全智贤 饰)尤其出众。小夜是吸血鬼和人类结合生下的女孩,她表面上是一个16岁的普通女高中生,实际上却是年龄接近400岁的吸血鬼猎人。她受命潜入美军基地内一所美国人学校,在此结识了将军的女儿爱丽丝(Allison Miller 饰),并将其从吸血鬼的手中救出。真祖及其手下蠢蠢欲动,他们和猎人绵亘了数百年的恩怨终于要做个了断……In 1970, the four hundred year-old skilled samurai Saya is sent to the Kanto High School in an American military base in Tokyo by the Council, a secret society that has been hunting vampires for centuries. Saya has the appearance of a teenager but is the tormented half-breed creature with the soul of her human father and the powers and need of blood of her vampire mother. She is obsessed to face the powerful demon Onigen that killed her father. In the base, Saya saves Alice McKee, who is the daughter of General McKee and commander of the base, from the attack of several vampires. When General McKee is killed by a member of the Council, Alice runs to the hotel where Saya is lodged. They join forces and go to the countryside to chase Onigen.