Gyakkyou Burai Kaiji: Ultimate Survivor S01

Kaiji Itou is a loan shark and a con artist, one day he meets a man who introduces himself as Endou with a proposal for Kaiji. It seems that a valuable gem that disappeared when Kaiji worked at his store, and Endou holds Kaiji responsible. Now Kaiji can go to a ship where all the debtors like him are, and win the money that Endou gives him to gamble with, pay off his debt, or work for Endou forever. Kaiji decides to go to the ship to not only pay off his debts but also to make some extra money.