This series' idea of an underling is so extreme. Like... almost no human would ever agree willingly to be an absolute slave to another in body AND mind for eternity.
Usually these series paint vampires in an acceptable light, but under these conditions, her clan are essentially slavers who pray on mentally weak individuals or those who want to die.
In the real world, we would slaughter them to the last and call it justice. The concept is so out of place here that it keeps distracting my mind from the cuteness and Yuri.