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.

Working through the night, the Robot Research Club members and the throngs of volunteers finish modifying GunBuild-1 before the Black Hole Bomb can be launched. The club members also devise a number of strategies for the upcoming final battle.

Chaos erupts at the Robot Expo as Misaki starts destroying robots left and right. Meanwhile, slowly, but surely, Kaito begins to learn the truth behind everything.

At last, the Robot Research Club enters the ROBO-ONE tournament! The revolutionary KILL-BALLAD control scheme makes Kaito a force to be reckoned with, but will it be enough to win the tournament and save the club?

The Robot Research Club is going to be shut down unless it can win the upcoming ROBO-ONE tournament. Akiho and Kaito have to somehow find a hobby robot and master its controls in only two weeks.

Kaito and Frau team up to locate Kimijima Report No. 3, but it won't be any easier than last time. Meanwhile, the final, unaired episode of GUNVARREL is leaked online...

At last, the Robot Research Club enters the ROBO-ONE tournament! The revolutionary KILL-BALLAD control scheme makes Kaito a force to be reckoned with, but will it be enough to win the tournament and save the club?

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

Subaru seeks Kaito's help for the upcoming ROBO-ONE World Championship in Las Vegas. Meanwhile, Akiho struggles to keep the club funded while Kaito reflects on a life-changing incident.

The Robot Research Club is in dire straits - there are only two members and the future of the club is in jeopardy. Despite this, the club's leader, Akiho, is intent on building a life-sized robot based on her favorite anime, GUNVARREL!

Kaito and Junna set out to investigate the strange "ghost" that Kaito caught a glimpse of... but only succeed in discovering more mysteries.

Kaito and Junna set out to investigate the strange "ghost" that Kaito caught a glimpse of... but only succeed in discovering more mysteries.

Subaru and Kaito start practicing for the upcoming ROBO-ONE world tournament in Las Vegas. During his off-time, Kaito stumbles upon a mysterious room inside the abandoned folk museum.

At long last, the Robot Research Club completes its giant GunBuild-1 robot! And, as people from all over the island watch, the robot takes its historic first step!

While Kaito and friends encounter more mysterious phenomena, another solar storm suddenly hits the Earth. Meanwhile, Akiho gets the GunBuild-1 project funded and rolling full-steam ahead!

After the outcome of the GunBuild-1 start-up test, Subaru tries to convince Akiho to build a new robot from scratch. Meanwhile, Kai unexpectedly makes the discovery of the century...