In Academy City, a cutting-edge competition known as the 'Computerized War Machine Virtual-On' captivates students as they control massive Virtuaroids in intense street battles. The distinction between Level 5s and Level 0s blurs in this high-stakes contest, fueling its popularity. Amidst this fervor, Index and her white Bal Bados face off against Touma and his stock Temjin. A mysterious girl named Ririn, known for her sleepless nights, emerges in the city, crossing paths with Kamijou. Unexpectedly, a fusion between the Virtual-On technology and Academy City sets the stage for a monumental clash, drawing in formidable players like Misaka Mikoto with her Raiden and Shokuhou Misaki with her Angelan, heralding a showdown like never before.