Salaryman Rokurou Okajima spends his days trying to climb his company's corporate ladder, until one day when a business negotiation in Thailand goes awry. During the botched deal, he falls hostage to the Lagoon Company—a band of ruthless pirate mercenaries. Left to the whims of his captors after his managers refuse to pay his ransom, Rokurou does the unthinkable: instead of begging for his life, he joins the very crew who kidnapped him. Now a member of the group, Rokurou must adjust to his new residence in the dissolute hellscape known as Roanapur, a city where corruption and crime run rampant, and even the smallest slipup could cost him his life. If not for one of the many crime syndicates on the island, Rokurou also constantly finds himself at odds with his brash, gunslinging colleague, Revy. As Rokurou struggles to abandon his past—and with more than just the profits from the Lagoon Company's illegal trading on the line—he must quickly find the resolve to make tough decisions in high-stress situations while keeping his humanity intact.

It has been 10 years since Heaven's Gate appeared in South America and Hell's Gate appeared in Japan, veiling the once familiar night sky with an oppressive skyscape. Their purposes unknown, these Gates are spaces in which the very laws of physics are ignored. With the appearance of the Gates emerged Contractors, who, in exchange for their humanity, are granted supernatural abilities. In the Japanese city surrounding Hell's Gate, Section 4 Chief Misaki Kirihara finds herself at odds with an infamous Contractor codenamed Hei. Called Black Reaper in the underground world, Hei, like his associates, undertakes missions for the mysterious and ruthless Syndicate while slowly peeling back the dark layers covering a nefarious plot that threatens the very existence of Contractors. From the mind of Tensai Okamura comes a sci-fi thriller taking the form of a subtle exposé on a war in which political positions and justice have no sway—a war waged exclusively in the shadows.

A series of unfortunate events has led Makoto Edamura to adopt the life of crime—pickpocketing and scamming others for a living. However, after swindling a seemingly clueless tourist, Makoto discovers that he was the one tricked and, to make matters worse, that the police are now after him. While making his escape, he runs into the tourist once again, who turns out to be a fellow con man named Laurent Thierry, and ends up following him to Los Angeles. In an attempt to defend his self-proclaimed title of Japan's Greatest Swindler, Makoto challenges his rival to determine the better scammer. Accepting the competition, Laurent drops them off outside a huge mansion and claims that their target will be the biggest mafia boss on the West Coast. As Makoto becomes increasingly involved with the cunning Laurent, his colorful associates, and the world of international high-stakes fraud, he soon realizes that he got more than what he bargained for as his self-declared skills are continually put to the test.

Rokurou Rock Okajima has joined the Lagoon Company, a pirate mercenary group which operates out of Roanapur, Thailand. Despite his initial protests, this filthy slum of depraved souls and merciless criminals now serves as the former salaryman's home. Stranded, with nothing left of his past life but the clothes on his back and his inner morality, Rock is forced to perform jobs alongside the other members of the Lagoon crew. Berated for his lack of spine as he wades through the underbelly of society, he must decide whether to continue on amidst the gunfire and ruthlessness or risk everything he has in an attempt to be free. Whether he chooses the comfort of a familiar land or the freedom of being an outlaw, his decision will have lasting consequences on the crew who gave him a home.