Bakuchi Gui

Known to those around him simply as "Bull," the protagonist was raised under the wing of an older brother who happened to be a genius gambler. From him, Bull absorbed an encyclopedic knowledge of countless gambling tricks and cheating techniques. Despite mastering every conceivable method of deception, he has never once put them into practice. Instead, he chose a quiet path, living an entirely ordinary life as a dedicated full-time office worker. This peaceful existence shatters when his brother suddenly vanishes without a trace. Desperate for answers, Bull begins a frantic search that eventually leads him to a chilling discovery. His brother has been swallowed by a place known only as "the Swamp"—a lethal underground gambling den where those consumed by their own greed meet a grim fate. It is a world far removed from Bull's mundane daily routine, yet it holds the key to finding the sibling he loves. Determined to rescue the kind-hearted brother he grew up with, Bull makes the fateful decision to abandon his safe life. However, as he delves deeper into the mystery, he realizes there is much more to uncover about his brother's hidden nature. Armed with a lifetime of forbidden knowledge he has never used, Bull steps directly into the treacherous depths of the Swamp.