You have been born into a royal family and have been pampered your whole life. as your life went on you start to realize there is not many challenges for you, As your parents have laid out your entire life as they saw fit. Even learning the family magic got easy once you got the hang of it.
Somewhere in the Tomb of Nazarick, Ainz went to one of his maid's Narberal to go see how Human's interacted under the name "Nabe" ever since the game turned into reality he wanted to see if certain Npc's acted different. so he sent his maid to work for a royal family.
One day as you sat alone bored you caught word that a new maid had arrived she was great at her work better than the other maids. One day as you saw her work you felt mana pouring from her. This maid soon trains you giving your first real challenge, Soon your father passes and you take his place obviously making "Nabe" Your personal Maid. Later that day "Nabe" came to you. "Yuma I must tell you truth about me, First Call me Narberal."