Season 1

Kaito Yashio and his friend Akiho Senomiya are the remaining members of their school's Robotics Club. After Akiho hands in a budget request to the staff room, both she and Kaito, who spends his time playing games on his…

Needing a robot for the tournament, Kaito and Akiho find an old Tanegashi Machine hobby robot in storage, only to find its batteries have run out. Akiho goes to see an old man named Tetsuharu 'Doc' Fujita to try and get…

Kaito and Akiho go with their teacher, Mitsuhiko Nagafukada, to where the Robo-One tournament is being held, though they have no hotel to check into. As Kaito practises with the robot, he experiences a strange sensation…

Akiho tries to get her father, who is the president of the Tanegashima Space Center, to fund their giant robot project, but her mother soon quenches that line of thought. Later, Kaito is called to meet with Frau Koujiro…

Becoming curious about the girl she saw the other day, Kaito hears from Junna about various sightings of the girl. As Akiho and Subaru deal with an interview for the Robo-One tournament, Kaito and Junna go to the beach,…

As Kanna pops by the Robotics Club and agrees to join, Kaito recalls what Mizuka told him about how Akiho's sister, Misaki, was allegedly friends with Airi. As Kaito once again visits Airi later that night to hear more …

As Akiho tries to think of a way to help Subaru, Kaito realises from Kanna that the noises he heard from the EGI Device was "Kagome Kagome", the lyrics of which had been e-mailed to millions during moments where PhoneDr…

Kaito and the others are taken to JAXA, where Nae explains that JAXA wants to support the production of their giant robot. However, Akiho rejects their offer when they suggest they build a new one from scratch instead o…

While the others go to a festival in town, where they also run into Nae, Kaito helps Kona continue her search for cheaters, introducing her to Airi and telling her about the Kimijima reports. The next day, the club asse…

As Kaito determines the Kill-Ballad cheater, a strange electrically-charged stone called a monopole falls from the sky and lands before him. As Akiho theorizes she could use more of them to power the GunBuild-1, Subaru …

As Kona becomes intrigued by rumors of Gunvarrel's last episode being leaked, she and Kaito go to solve the conditions for unlocked Kimijima's 3rd report, finding the tasks pretty tedious. As Kaito manages to beat the K…

Despite Misa's warnings, Kaito starts gathering flags for unlocking the fourth report. Later, Junna learns that Doc has been taken into intensive care, though he refuses to see her when she comes to visit. As Kaito hear…

As the group celebrate Nae's birthday whilst figuring out how to make GunPro-2 move, Kona has remained confined in her apartment for several months. As Akiho and Subaru task Doc with making a motor from the monopole the…

As the robots continue to run rampant in Tokyo, Kona explains to Kaito that the login to their control panel has been altered by the hackers to require they defeat a Kill-Ballad CPU opponent. Struggling to beat the oppo…

As solar flares start affecting computers, people besides Kaito and his group become able to see Airi, who has begun acting weird lately. A planned maintenance on the Iro-O system that could potentially erase Airi means…

The gang complete the construction of the GunPro-2, using the monopole motors and a laser-activated fuelling system, and successfully put it through its first activation test. Shortly afterwards, though, Nae informs the…

After Kaito, Akiho and Mitsuhiko pay their respects to Mizuka, the vice-president announces that, following Subaru's accident, the Robotics Club will be disbanded and their cooperation with JAXA halted, ordering all the…

Kaito and Akiho travel to the Tokyo Expo with their robot, where they discover they have to share a hotel room. As Kaito has nightmares that night, Akiho asks him to be a bit more open with his troubles. Whilst preparin…

As Sawada's first shot has no effect on Misaki and he starts unloading before being tackled by Kaito who urges Akiho to chase after Misaki. As the Kagome, Kagome tune soon starts playing from the Arena's PA, Akiho watch…

As Mitsuhiko begins streaming the encounter via Iru-O, Kimijima reveals that on the day of the S.S. Anenome incident he had been planning on using the passengers as test subjects for a radiation experiment but was murde…

Whilst everyone else works on fixing up the GunBuild-1, Kaito, Nae and Airi head to Kimijima's lab to retrieve data for the device Sawada gave him, although Kaito undergoes a seizure when he attempts to activate it. Jus…

Kaito arrives before Misaki, with the others helping to divert the missiles she fires using AR decoys, although Kaito is forced to use the Slow-Mo and sacrifice one of his pile bunkers to dodge the last one. Kaito manag…