The most unpopular princess of the Dalin Dynasty - Tang Ming.
The most noble vampire in Europe - Yagafa Zero.
Tang Ming accidentally traveled through time and space and came to the famous vampire castle in Europe.
Fortunately, he signed a treaty with the owner of the castle, Yagafa Zero.
After learning Graven (the language used by vampires), Tang Ming discovered that the agreement on the paper was actually a marriage contract!