Hajime Nanba, a boy who started a Game Boy circle with his friends, has been training every day with the aim of becoming the best gamer in Japan. One day, while chasing the whereabouts of his brother "Sho Nanba" who suddenly disappeared, he learns the existence of a mysterious secret society "BUG" that plans ambitions using games. In order to rescue his brother and stop his ambitions, Hajime Minamiba challenges BUG to a game showdown.