The first Kaiji spinoff manga, Chūkan Kanriroku Tonegawa (Middle Management Chronicle Tonegawa), focusing on the character Tonegawa, launched in June 2015 in Kodansha’s Monthly Young Magazine, where it is ongoing.
This year’s combined 4th and 5th issue of Kodansha’s Weekly Young Magazine launched a second spinoff manga series for Nobuyuki Fukumoto’s Kaiji manga last week.
The spinoff is titled 1-nichi Gaishutsuroku Hanchō (One-Day Outing Chronicle Leader) and it focuses on the character Ōtsuki.
There were three Kaiji sequels before Fukumoto launched Tobaku Datenroku Kaiji One Poker-Hen in 2013.