As Ryu Soma he fights off the alien invasions along with Frank and other pilots. While he may seem like a trustworthy ally and brilliant strategist to his co-worker due to his talents in metallurgy, he is actually secretly waiting for his chance to eliminate Frank and get his revenge.
He has a difficult time dealing with the naive orphan girl Hattie, who has the special gift of being able to control Frank. She bears a striking resemblance to his girlfriend Maki, however she is not only naive but believes Frank to truly be an elf. This at times causes Ryu's rage to be directed onto her as he finds his desire to kill Frank conflicting with her views, but at the same time he is not without kindness towards her.