Persuaded by UN Inspector Akane and Ken, Kazuki becomes the Hartzenen’s pilot, astonishing the team since only females can typically operate core robots. Meeting the alien D, Kazuki trains to control the robot alongside Mitsuki and D. His first battle is terrifying, but when his teammates face danger, Kazuki overcomes his fear to protect them, proving his potential. As the UN marvels at his unique ability, Kazuki begins to embrace his role in the ongoing war against the Rara army.