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 preparing for the expo, Akiho becomes excited when she hears Misaki will be at the expo promoting the Exoskeleton robots. Kaito decides to meet up with her in person in order to confront her about Mizuka's death, also talking about Kimijima, her meeting with the real Airi, who woke up in hospital the other day, and above all, her attitude towards Akiho. The Tokyo Expo soon begins with Akiho having a tough time impressing the crowd with the recent bias against Gunvarrel. Despite Kaito's warnings, Akiho goes to see Misaki, who is seen in a fully robotic suit. Just then Sawada appears and brings out a gun, shooting it when Misaki starts to run away.

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 watches in disbelief as Misaki boards the Sumeragi and begins reeking havoc within the expo, by destroying the other robots. As the Sumeragi sets its sights on GunBuild-2, Akiho tries in vain to defend it and has another EMS seizure upon its destruction, followed by Kaito upon seeing Akiho's state before Misaki escapes. In the aftermath, whilst getting Akiho to safety, Kaito discovers a massive obelisk has appeared out of nowhere, which Akiho deduces to be the space elevator from the leaked Gunvarrel episode. As the Haneda and Narita Airports are shut down due to a massive solar flare which is blamed for the Expo's attack, Airi has a mysterious visitor in her hospital room as the Airi AI begins singing Kagome, Kagome from her Poke-Com.

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. Just then, they are confronted by some armed droids run by Kimijima and Sister Centipede. However, Sister Centipede manages to have the droids shoot each other, only to be erased by Kimijima shortly afterwards. Meanwhile, as Akiho and the others complete the GunBuild-1, which she renames the Super GunBuild-1, she reunites with Ken'ichirō before learning of Kaito's condition. Despite his injuries, Kaito insists that he be Super GunBuild-1's operator, believing that the device Sawada gave him can trigger his Slow-Mo at will, giving him a chance against the Sumeragi. Akiho objects, however, believing using the device could kill him. Kaito assures her that he will help her meet Misa face-to-face again, giving her the Slow-Mo trigger.

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 manages to get up close to Misaki's Sumeragi and use the Slow-Mo to attack her with the other pile bunker. However, this knocks Misaki out and allows Kimijima to take full control of her as he divides the Sumeragi into a more mobile unit. After locking down the launch sequence, despite Nao and the other adults reclaming the control room, Kimijima launches an attack at the others forcing them to seperate, which leaves the Super Gunbuild-1 with only five minutes of power. Just then, Kona receives a program from Sawada that will erase Kimijima if they can get his avatar in the PokeCom's view, although it requires a reboot which leaves Kaito vulnerable.