Gambling Apocalypse Kaiji manga volume 4 features story and art by Nobuyuki Fukumoto.

A rare survivor of the Human Horse Race, Kaiji is invited to join another deathmatch…This game is called E-Card!

Having survived the games at the Starside Hotel, Kaiji is invited to join another game for a chance at even more cash! But while the previous game was physically challenging, this game, E-Card, is socially twisted. At its core, it is a card game similar to rock-paper-scissors, but as the cards played - slave, citizen, emperor - the power balance is not in the favor of the challenger.

Gambling Apocalypse Kaiji manga volume 5 features story and art by Nobuyuki Fukumoto.

After surviving Tonegawa's dastardly schemes set outside of the hotel tower, Kaiji was let inside the building for what may be one last chance to pay off his debts. But while his last two tests were partially physical and emotional, this new game is a test of wills. E-Card is a simple card game but when played against someone who says he can read minds, it may be an impossible game to win at consistently! Kaiji has gone too far now, so he'll literally put his body on the line as payback!