Struggling under a mounting debt, Kaiji Itou reverts to his old habits until a chance encounter with Yuuji Endou changes his fate. Unwittingly falling into Endou's trap, Kaiji is whisked away to an underground labor camp by the ruthless Teiai Group to repay what he owes. With a 15-year sentence looming over him, Kaiji must toil alongside other debtors, dreaming of a single day's respite on the surface. Determined to break free, he plots a risky gamble to secure his liberation. Yet, as the harsh reality of his confinement threatens his resolve, Kaiji faces a precarious path where he might be forced to wager sooner than anticipated.