Super Eyepatch Fox
An unemployed drifter learns that a coworker's vanished loan has become his crushing debt. A collector offers one possible escape aboard a ship where debtors gamble with borrowed money. The rules may be simple, but desperation turns every choice and handshake into a psychological weapon.
Gigguku
Kaiji gets on a boat full of desperate debtors, and suddenly the simplest game imaginable feels like a battlefield! The narrator attacks every calculation while sweat pours like weather. One bad read can multiply the debt crushing everyone in the room. This is panic rendered at architectural scale.
Father's Basement
Kaiji is irresponsible and resentful, making him initially difficult to defend. That also makes him ideal prey for a system built to monetize desperation. The harsh faces and intrusive narration refuse cool gambling glamour. Every rule is easy to understand, leaving character judgment and social pressure exposed with nowhere to hide.