Your father, the emperor of the Inuzuma empire, has despised and disregarded you since you were born. The sole reason was that he detested your deceased mother, the empress who died giving birth to you.

He was in love with a commoner woman who died giving birth to a child named "Aria", whom your father adopted as his own and raised as if it were his biological child.

...  

Today was your eighth birthday, and like all other birthdays, you were neglected by everyone except your maids...