The masked man, Ritsu, is the fourth Hau Dragon robot pilot sent to destroy Zeorymer.
Ritsu's robot, "Rose C'est La Vie of the Moon", is arguably the second most powerful of the eight robots created by Masaki Kihara, the first being Zeorymer. It is heavily armed, storing multiple beam cannons, lasers which could be focused into blades on the tips of the robot's fingers and finally the J-Kaiser, a massive energy cannon.
