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Two years ago, Ayumu Narumi's older brother Kiyotaka, a famous detective and pianist, disappears without a trace. Ayumu's only clue as to his brother's whereabouts is the phrase "Blade Children," the only words Ayumu could make out in Kiyotaka's final phone call.

Aizawa Yuichi had often visited his cousin in the city when a young child. However, something drastic happened to keep him away for seven long years.

Within Thailand lies the city of Roanapur, a safe haven for all types of criminals and where corruption thrives to its very roots. Ran by big crime syndicates like the Yakuza or the Russian and Italian mafias, Roanapur is the center for illegal and criminal activities, and is the base of operations for the notorious group called Black Lagoon.