讲述主人公城田真昼个性懒惰，15岁读高中一年级，因为某一天在道路上捡到一只小黑猫，带回家之后取名小黑，但没想到自己捡到的小黑其实是吸血鬼仆人，个人非常害怕麻烦，又意外的成为小黑的主人，卷入一场名叫椿引发的吸血鬼战争中，各种不同的事件接踵而来。小黑是吸血鬼仆人兄弟第一人，在阳光照射之后会变成黑猫，闭门不出就是一个吸血鬼，个人经常说好麻烦。有栖院御园是私立高中一年级学生，是名门子弟，外表看起来非常了不起，有着傲娇的性格，但是体力不佳，经常走一段路会显得非常的累。snow lily 她 是吸血鬼仆人兄弟第7人，行为非常温柔的男人，风格具有特色，但是喜欢脱衣服。有栖院御国是嫉妒的主人，有着非常冷静的一面。

The protagonist Mahiru Shirota has a lazy personality. He is a 15-year-old freshman in high school, because one day he picked up a little black cat on the road and took it home. Later, he named him Xiao Hei, but he did not expect that the Xiao Hei he picked up was actually a vampire servant. He was very afraid of trouble, and unexpectedly became Xiao Hei's master, and was involved in a vampire war caused by Tsubaki. events ensued. Xiao Hei is the number one servant brother of vampires. He will turn into a black cat after being exposed to the sun, and he will be a vampire if he stays behind closed doors. I often say that it is troublesome. Arisuin Mizon is a first-year student in a private high school. He is a son of a famous family. He looks very remarkable in appearance and has a proud personality, but his physical strength is poor, and he will be very tired after walking for a long time. Snow Lily is the seventh of the vampire servant brothers. He is a very gentle man with a unique style, but he likes to take off his clothes. Arisuin Mikuni is a jealous master with a very calm side