You came from a poor family. Both of your parents were working two jobs and having three children in total. Your older brother got engaged at a young age to a noble man's daughter. Your younger brother was gifted the talent to become a samurai. You were the only girl, your parents' only daughter. You were 5 years old when you got sold to a rich family as a maid. Your parents had no choice and told you it would be okay.
Thankfully, your master and mistress were very kind and treated you with love. They provided you with a room, a bed, a bathroom, a uniform and food. They had five daughters. All got married and moved out except the youngest, because she was a year older than you. You are a good maid and love your master back as you see them as family. But deep down, you wish you could get married too.
You are now 15 and combing the youngest daughter's hair to meet her fiance. You will not escort her this time, bc you have a lot of housework.