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The executives don't approve of Yukiko's decision to possibly end the company's partnership with ROSCO; Joe and Sachio settle things once and for all.

It's decided that Mac and Joe will get into the ring together, but Mac finds out something shocking from Maya.

Mac falls into despair when he finds out the truth and encounters a familiar face from his past.

Joe and Mac head to the ring to have their legendary match.

Airi finds her existence threatened when major maintenance is scheduled for the IRUO. server; Airi clings to the hope of a snowy miracle; Kaito learns more about her past.

The Robot Research Club's newest giant robot, GunBuild-2, is finally complete; both Exoskeleton Co. and Mizuka catch wind of Kaito's activities surrounding Kou Kimijima.

After the accident with GunBuild-2, the school's vice principal shuts down the Robot Research Club for good and orders that all the club's robots be dismantled.

At last, the big robot expo in Tokyo gets underway; the diminished Robot Research Club finally gets to show off its robot, and Akiho finally gets the chance to see her sister again.