Story
In Robotics;Notes, the player assumes the role of Kaito Yashio, someone who enjoys fighting games.[3] He is in his school's robot club along with his childhood friend Akiho Senomiya.[5] The story begins when Akiho decides to build a robot based on the Gunvarrel animated series she is a fan of, and she recruits Kaito to aid her. With the robot club short on members and on the verge of closure, Kaito heads out to try and recruit more members, eventually securing the support of professional robot battler Subaru Hidaka, karate practitioner Junna Daitoku, and the world renowned programmer Frau Kojiro. Together, they begin the process of building their replica of the titular Gunvarrel, the Gunbuild-1. However, reality quickly sets in when they realize the physical impossibility of completely replicating Gunvarrel, and are forced to make many design compromises. In addition to the relatively primitive Gunbuild-1, they also manage to build the more advanced Gunbuild-2. They also take advantage of the Iru-O system to change both Gunbuilds' appearances via augmented reality.
As Gunbuild-1 is being developed, Kaito also comes across the "Kimijima Reports", authored by the deceased scientist Kō Kimijima who claims an impending solar flare will wipe out all life on Earth. Kaito also encounters two AI personalities that inhabit Iru-O, Airi and Sister Centipede, who help him track down the other reports. Kaito follows the instructions in the reports in an effort to avert the solar flare, and in the process wakes up Airi Yukifune, the girl the AI Airi is based on, who was put into suspended animation due to a then incurable illness. However, Kaito discovers too late that the reports were a lie, and that it is Kimijima himself, now an AI living within the Iru-O system, attempting to trigger a solar flare on the behalf of the Committee of 300 in plan dubbed "Project Atum".
Moving on to the next stage of his plans, Kimijima deletes Airi and seizes control of Akiho's older sister Misaki, stealing an experimental battle robot called SUMERAGI and destroying the Gunbuild-2. Meanwhile, the Committee of 300 orchestrates mass robot rebellions all over Japan, plunging the country into chaos while a commando team seizes the Tanegashima Space Center with the help of SUMERAGI. The robotics club is then approached by Nae Tennouji and Toshiyuki Sawada, who reveal they are part of a secret group that resists against the Committee of 300, and that the Committee plans to use Tanegashima to launch a rocket containing bombs that will create an apocalyptic solar flare that will wipe out the majority of humanity, allowing the Committee to rule over the survivors and rebuild the world according to their will. Sawara provides the robotics club with a special code that can completely delete Kimijima, but requires them to be in close range to send it. Working together with the other Tanegashima residents, the robotics club upgrades Gunbuild-1 into the Super Gunbuild-1 and Kaito pilots it against SUMERAGI while Nae neutralizes the commandos. Kaito is able to force Misaki to exit her cockpit, leaving Kimijima vulnerable and allowing Kaito to delete him, though Kimijima boasts that another copy of himself will surely surface.
With Kimijima gone, Nae is able to abort the rocket launch and thwart the Committee's plan. The robotics club is then greeted by the Tanegashima residents who celebrate them as heroes.
