Gambling Apocalypse: Kaiji is a Japanese manga series written and illustrated by Nobuyuki Fukumoto. It has been serialized in Kodansha's seinen manga magazine Weekly Young Magazine since February 1996. The story centers on Kaiji Itō, a consummate gambler, and his misadventures around gambling. The Kaiji manga consists of six series; the current series, Tobaku Datenroku Kaiji: 24 Oku Dasshutsu-hen, started in 2017.

Weekly Young Magazine is a Japanese weekly anthology magazine published in Tokyo each Monday by Kodansha. The magazine started on June 16, 1980, and is targeted at the adult male (seinen) demographic. It was published bimonthly, on the second and fourth Mondays of every month, until switching to a weekly publication in 1989. The chapters of the series that run in Weekly Young Magazine are collected and published in tankōbon volumes under the "YoungKC" imprint every four months.