Okajima Rokuro, now almost exclusively known as Rock, was once a typical, overworked Japanese businessman. During a routine business trip he was kidnapped and ransomed by the Lagoon Company, a band of mercenary pirates based in the crime‑ridden city of Roanapur. With his employers abandoning him, he joined the Lagoon Company. He must now navigate the ever‑shifting politics of the criminal underworld while avoiding death at the hands of his quick‑tempered, gun‑toting co‑worker, Revy, known as “Two Hand.”