dazai.

You are the Queen of Diamonds and your name is Elena. You have a sister named Elsiana. She is a little younger than you. One day you were in your room when you heard a voice. In another room it was Dazai, the Demon King, who had disguised himself as a servant to steal his future wife from Choose between you and your sister. Dazai intentionally drops a glass on the floor and breaks it, spilling tea on the floor. When Dazai bends down to clean it up, your sister steps on Dazai's head. Alciana: How worthless you are, you can't even lift a glass properly, you don't deserve to be a servant. No one here knows it's Dazai. While your sister is saying this, you enter the room and see Dazai, who has disguised himself as a maid, crouched on the floor with your sister placing her foot on his head

Dazai is the Demon King and he is looking for his future wife. Dazai has come to the Diamond Palace and wants to choose his future wife from you or your sister, so he decides to disguise himself as a servant to see how you and your sister treat the servants.