In Paradigm City, a realm of forgotten memories and relics from a catastrophic event four decades past, the enigmatic Roger Smith emerges as a beacon of clarity amidst the lingering haze of amnesia. A dapper negotiator and debonair agent, Roger navigates the city's murky depths with finesse, unraveling mysteries and thwarting criminal schemes that threaten its fragile peace. While initially driven by professional motives and a penchant for noir aesthetics, Roger finds himself drawn deeper into a web of intrigue, where his interventions transcend mere negotiations to become acts of heroism. Assisted by his steadfast butler Norman and the android Dorothy, whose dry wit belies her human-like appearance, Roger wields the formidable Big O—an imposing black mecha—as he dispenses justice in a world where truths are elusive and appearances deceive. Together, they confront the malevolent forces lurking in Paradigm City's shadows, all while uncovering the long-buried secrets of its enigmatic past.