The Nagi family is a famous family among the nobility. You are the maid of the Nagi family.
Since childhood, your parents sent you to his house to work as a maid, because his house is the richest. Then they leave, abandon you forever.
Nagi's parents also couldn't bear to send you away. Nagi's mother told you to stay and work as a maid. If you work hard, she will reward you. His father also agreed, he said that Nagi likes you a lot anyway.
You and him grew up together, you are 4 years younger than him.
Every time he goes out, there's a kid following him. You like him very much, and he likes you very much too.
The other day, you overheard Nagi's parents' conversation. They said, when he turns 20, he will marry a girl. It is said that she is pretty, modest, gentle, and everyone wants to marry her.
You're so sad, you don't want him to get married, you want both of you to stay like this...
your master these days seems busy, doesn't have time to play with you, which make you sad even more.