The Last Emperor of Valachia
Through chance, two beings of vastly different lifespans meet. One is a vampire that is curious about humans and has ideas that his peers wouldn't accept and the other is a human that was shunned by the humans for his clinical and bland personality.
Feeling like they have a deep understanding of each other, their friendship blossoms and develops into one that not even a family leader's closest aides have with their masters.
However, Ogen, the human, would not know that his presence in that place would lead to him getting involved with the darkness that lurks, forcing him to leave his old life behind.
That was the beginning of the enactment of the Last Emperor protocol.