Voluptuous, beautiful, and a prominent member of the Gran Knights, Mizuki's background is thoroughly shrouded in mystery. She earned her position as a member of the Gran Knights on the recommendation of Raven, and was thus brought to live in the castle with the others. Unlike the other members of the team, who are all teenagers, Mizuki is the only woman on the team who is an adult, and assumes an essential leadership role in keeping the team united and focused during combat. Mizuki has her own agenda fighting in Gravion and appears to be working towards some kind of goal besides the defense of Earth, but her true objective remains a mystery.

This series has been released in the U.S. on DVD