The 2nd part of the Kaiji series.
After Kaiji's showdown with Chairman Hyoudo at Starside Hotel, Kaiji is forced into labour at an underground mine. With meagre wages each day, he will work for decades unless he doesn't do something.
Now Kaiji must wager his earnings in underground Chinchirorin gambles for a ticket to the rest of the world. But even if the surfaces, he only has one chance to pay back his enormous debt, and that is by challenging the "unbeatable" Pachinko machine, The Bog.