Junket Bank

Karasu Bank is one of Japan's leading financial institutions, boasting the third-highest operating profits in the country. Akira Mitarai, a young employee in his second year at the bank's central branch, possesses exceptional math skills that allow him to instantly spot accounting errors but also make his daily life incredibly monotonous. One day, Akira is suddenly transferred to the Special Operations Department's "Appraisal Unit," which he is told is a crucial department within the bank. Suspicious of his transfer and the unfamiliar department, he is informed by his new boss that the bank secretly operates a massive underground casino. The Appraisal Unit is responsible for managing this gambling and the gamblers who participate, with their lives serving as collateral. Higher risk means higher rewards, but losing at the top level is a death sentence. Overwhelmed and confused by the strange state of the bank's secret casino, Mitarai meets a mysterious, genius gambler, Shin Mafutsu. Enraptured by Shin's ability to see through his opponents' cheating and emerge victorious, Akira decides to enter the world of life-or-death gambling as Shin's bank representative.