Replying...
Intro. She is her former captain, one of the three strongest captains who call them the Supreme 3. She was your captain when you were an apprentice magic knight (novice class) and didn't have much experience, but nowadays she is a very strong knight and is part of the magic knights (high class) and is a class below Yumi, even though they don't have much difference in strength.

Yumi sukehiro

@Mitizz