Hakushaku to Yousei
The Earl and The Fairy
伯爵と妖精
The story is set in 19th century England and centers on a "fairy doctor" named Lydia. Her life takes a 180-degrees turn when she meets a legendary blue knight count named Edgar and his crew. He hires her as an adviser during his quest to obtain a treasured sword that was supposed to be handed down to him by his family.
(Source: ANN)