Millie

Millie is an adventurer and usually travels together with her team partner Nina. Her specialty is swordsmanship. When Kain is five years old, she—like Nina—is hired by his father to train him. However, from the very beginning she is completely overwhelmed by the boy, as he is far stronger than she herself is. At the time she works as a teacher, she is still a D-rank adventurer, but later she manages to rise to B-rank. She is the sister of Claude, a high-ranking A-rank adventurer.