Kazuki can see what no one else can: a parallel world where giant robots battle and destroy the city. Mitsuki introduces Kazuki to her father Ken Sanada. He is a college professor that tinkers in high tech quantum physics in his basement during his spare time. Ken believes he's found the bridge between these parallel worlds and tests Kazuki to learn why he's the only one who can see it. The quantum portal machine is accidentally activated by Mitsuki and Kazuki is sent to the alternate world. Kazuki does not realize he's in the alternate world at first until robots almost step on him. When the Hartzenen robot falls in front of him during a battle, the injured female pilot stumbles out and collapses into Kazuki's arms. Kazuki is forced to activate the robot and enter the fight himself.