In the year 2099 of the Unified Calendar, within the sprawling metropolis of Shinjuku City, a legendary figure emerges once more—Bertolt, the fabled Demon King. This futuristic urban landscape, a pinnacle of human achievement, radiates with unparalleled prosperity. Yet, beneath its dazzling exterior lies a shadowy undercurrent of hidden darkness. As the Demon King descends upon this advanced city-state, his ambitions extend beyond mere conquest; he seeks to dominate a new world shaped by progress and innovation. The clash between the brilliance of civilization and the grim forces lurking in its depths sets the stage for a transformative struggle. In this era where technology and tradition intertwine, the Demon King's return heralds a pivotal moment that will redefine the future.