Junket Bank

Meet Akira Mitarai, a second-year bank employee whose brain runs like a calculator on overdrive — he catches accounting errors instantly, which sounds impressive until you realize it means his job bores him to death. Then he gets transferred to a department he's never heard of: the "Appraisal Unit" inside Karasu Bank's Special Operations division. Turns out one of Japan's most powerful banks is running an underground gambling ring for the ultra-wealthy, where people wager their fortunes, their futures, and sometimes their lives in psychologically brutal games. But here's the twist — Akira doesn't sit at the table. He's assigned as a handler for a reckless, adrenaline-addicted gambler, which means his job is to out-think the opponents from the sidelines while managing someone who actively wants to dive headfirst into chaos. The dynamic between the cold, math-driven analyst and the unhinged player is what really makes this tick. The games themselves lean hard into probability, logic traps, and financial manipulation rather than pure luck, so if you're into watching someone dismantle a rigged system through sheer intellect, this is your lane. If you liked Kaiji for its desperate survival tension, or Kakegurui for the theatrical insanity of high-stakes gambling, Junket Bank sits right between those two but swaps the school uniforms and underground dens for corporate suits and boardroom corruption. It's a seinen through and through — slower, darker, and more calculated than you'd expect from the premise.