Hakushaku to Yousei 7.29
Summary: 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.
Other Name: Earl and Fairy, Hakushaku to Yosei, Count and Fairy, 伯爵と妖精