The Cross and the Travels of the Third True Ancestor of Vampires

In a blood city in the west, there is a country full of vampires called the Holy Blood City, which is also the West Russel Empire. There are twelve true ancestors of vampires who are responsible for managing these, especially a boy who looks like a girl. He is the third true ancestor here - Cerid North. Bell, who doesn't like others to think of him as a girl, inadvertently traveled to the world of "The Cross and the Vampire" during his third battle with the human brave army. If he wants to find a way back, he must attend this school called Yangkai Academy where all monsters go to school.