In modern society, school bullying has been rampant and has become a problem for schools and society. Haruyuki Arita (voiced by Yuki Kaji), who is obese and introverted, is a victim of long-term bullying. Haruyuki, who is cowardly, cannot resist the bullies, so he can only hide behind the Internet and vent his anger by playing dodgeball games. After a while, Haruyuki became the top scorer in the dodgeball game on campus. Kuroyuki Hime (voiced by Sachika Misawa), the vice president of the student union known as the "Black Snow Princess", appeared in front of Kasuga. Kuroyuki Hime not only stopped the bullying of Haruyuki, but also invited him to enter the equation called "BrainBuster", in which Kasuga became an overclocked linker with a thousand times the thinking speed and was involved in a fierce battle. Kuroyuki Hime summoned Kasuga and others for only one purpose, which was to reorganize the army of the former "Black King".