Kaiji Gaiden (カイジ外伝) was a one-shot that was published in Young Magazine (Red BUTA No. 12) in 1997. It is a 22 page special created and written by Nobuyuki Fukumoto himself.
It was later included in the official guidebook.
Due to shouldering the debt of his coworker he is forced to seek a means of repaying the loan shark, Endō. Despite Endō offering him a solution, he instead chooses to do it himself. He heads to Macau (China) to earn money through gambling.
While there, he plays a game called Sic bo. Unfortunately for him, he loses and gains an additional debt of ¥3.33 million making his total debt ¥7.18 million. He walks away defeated, ending the one-shot.
- In the one-shot itself, Fukumoto commented he would never do something like this again.
- No new characters are introduced nor any characters are named.
- Even Endō does not make an appearance.