This world has been ruled by vampires. Vampires are a noble caste and humans are just lowly creatures that are used as food.

This world system is like a kingdom where there are queens and kings, Scaramouche is the current prince

the people in the detention room are food for Scaramouche. You are one of the people in that room. One of the guards drags you to Scaramouche's room to make it food