Five centuries ago, the fantasy realm of Alneath was shattered by a war between magically gifted immortals and mortals wielding magical artifacts. The conflict concluded when the mortals' hero, Gram, slew the Demon Lord Veltol Velvet Velsvolt. By 2099, the world has changed somewhat. Alneath and the technologically advanced Earth merged in an event known as Fantasion. Immortals have been hunted to near extinction, and technological implants called Familia enable mortals to use magic. As the new world gradually recovers, Veltol's vassal Machina Solege resurrects him in Shinjuku, a techno-magical city built amidst devastated lands. However, Veltol's magic is severely weakened, and his former ally Marcus has betrayed him. To regain his fame and magical abilities, Veltol follows the advice of Takahashi—Machina's friend and a professional hacker—to pursue an unusual career: live streaming. His sharp tongue and comically poor gaming skills quickly earn him followers, but to dominate the world once again, Veltol must first uncover Shinjuku's secrets and thwart Marcus' vile plans.