Lin Yi transmigrates into a parallel world, arriving in 1990s Japan only to be immediately swept up in a violent conflict involving the nation’s largest yakuza syndicate. Forced to survive in the dangerous margins of society, he begins to uncover the dark underbelly lurking beneath Shinjuku’s glittering facade. In this era, within a developed nation that prides itself on democracy and human rights, Lin Yi discovers a shocking reality: a hidden kingdom of slavery where rival gangs enforce strict territorial control and openly traffic human lives. Navigating this brutal underworld, he must use his wits and resilience to carve out a path to power, starting from the humblest of part-time jobs.