Because of his father, he had been kept hidden away in the women's quarters since he was three. Just as he was fretting over how to return to his true self, he met her.
She was outgoing by nature and loved dressing as a man. She had practiced martial arts since childhood and studied military strategy, but she was born in a peaceful era and had no chance to put her skills to use. Meeting him finally gave her an opportunity to try out a few schemes.