Before joining he originally drove tanks. When first meeting Koji he praise him with great skills. When Sayaka ask why didn't Koji draw his laser gun like he did with Lori & Loru or Shun Azuma, since Masao looks like a Mechanical Beast. Koji replied it is because Sayaka also reminds Koji of one. As Sayaka chased Koji, Masao looked at a mirror to find out what so scary about him. In his first sortie, he was killed in action while the Daion was attacked from behind with a drill and finished off by several Mechanical Beast beams.