《吸血鬼骑士》根据由漫画家樋野茉理所绘画的同名少女漫画所改编。
黑主学院是一所有名的私立学校，分为普通部和夜间部。夜间部人员都是有超美型的精英学员。但他们有个特殊的身份：吸血鬼！并且这个身份不能让普通部学生知道。理事长的义女——普通部学生的黑主优姬，以及青梅竹马的锥生零担负起学院守护者的职责——处理人类学生与吸血鬼接触时所出现的麻烦。而在零的内心深处，因为4年前父母被杀害而痛恨着所有吸血鬼。
十年前的一个雪夜优姬迷路遭遇恶鬼，幸得贵族吸血鬼玖兰枢所救。十年后，两人在黑主学院再次相遇。对于救过自己性命的枢，优姬心中存着感激与仰慕，枢虽对优姬有好感，但却因种族间的鸿沟刻意远离。而零虽对优姬也有感觉，但坚硬的内心却阻止了他的感情。等待着他们的命运到底是什么.....
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