Shortly after she defeated her sister Diva, Saya Otonashi hoped to retire to a more private life with her family and friends. Fate had other plans, and she soon fell into what was supposed to be a thirty year slumber.
However, fate once again played its hand and Saya was awoken prematurely, her tomb ransacked and a thief stealing her blood. After reuniting with her Chevalier and lover Hagi they chased the thief to Eastern Europe, where things became even more complicated.
The two encountered a castle unlike anything they had seen before, filled with monsters in line with myth than reality.
The thief revealed herself to be a servant of a vampire named Carmilla, who desired Saya's blood for part of a ritual meant to obtain absolute power. Now, Saya must use what time she has been given to put a stop to Carmilla and her family, all the while drawing her blade against ghosts of her past.
