Serge Echigo reigns as a shadowy overlord within Judoh’s criminal underworld, steering its machinations as the enigmatic head of Echigo Shop. Dubbed the "power behind the throne," his influence commands deference from mafia syndicates despite his elusive public profile. With light grey hair, piercing green eyes, and an imposing authority akin to a CEO presiding over the city’s clandestine hierarchies, he embodies calculated control.

A buried truth reshapes his legacy: the original Serge perished years before the series’ events. His identity and empire were secretly usurped by Shun Aurora, who meticulously hijacked Echigo’s persona to dominate Judoh’s intersecting webs of crime and politics. From the shadows, Shun engineered a military coup, manipulated factions such as the Leonelli family, and perpetuated the illusion of Echigo’s enduring command.

Echigo Shop operates as a nerve center for underworld dealings, entwined with corrupt officials and organized crime. Its reach spans pivotal conflicts, including the Liberation Army’s coup and mafia power struggles. A silver-bullet pendant—later uncovered to hold damning evidence of Echigo’s schemes—serves as a linchpin in unraveling the depth of Shun’s deception.

The climax exposes Shun’s decades-long charade, shattering the myth of Echigo’s survival and recasting past upheavals as stages of Shun’s grand design to reconfigure Judoh’s power landscape. Though physically absent, Echigo’s fingerprints linger through entrenched corruption and institutional manipulation, irrevocably steering the city’s fate.