Haruyuki Arita is an overweight middle school student who is bullied and finds comfort in playing online games. However, his life changes drastically one day when he discovers that all his high scores have been surpassed by Kuroyukihime, the popular vice president of the student council. She invites him to the student lounge and introduces him to "Brain Burst," a program that allows users to accelerate their brain waves to the point where time appears to stop. Brain Burst also serves as an augmented reality fighting game, and to earn more points for acceleration, users must win duels against other players. Yet, if a user loses all their points, they will lose access to Brain Burst permanently. Kuroyukihime explains that she chose to show Haruyuki the program because she requires his assistance. She aims to meet the creator of Brain Burst and uncover the reason for its creation, but this is easier said than done; to achieve this, she must defeat the "Six Kings of Pure Color," powerful faction leaders within the game, and reach level 10, the highest attainable level. After the girl helps Haruyuki overcome the bullies who torment him, he vows to help her achieve her goal, and thus begins the duo's struggle to reach the top.