One day, a girl who was raised as a boy has her entire life flipped upside down... A nameless boy who dreams of, becoming a knight works as a servant for the renowned Romagnolo Family. One day when he is seventeen years old, the boy faces his first monthly period and his mother tells him that actually, he is a girl. She is Count Romagnolo's Illegitimate child and her mother secretly raised her as a boy to protect her.