Ao Bara Antique no Shoukoujo

The young girl Rosa has just lost her family and was in the depths of despair, when she driven out of her home and even robbed of her mother's belongings. Alvin, a handsome nobleman, is the only one who reaches out to help her. He gives Rosa a job, a place to stay, a blue dress fit for a lady, and more...
With the coming of the Industrial Revolution, the folktales about fairies are fading away. A lonely girl and a silver-haired gentleman find an irreplaceable love. This is a gentle fairy tale about the forgotten times.
(Source: Kadokawa, translated)