In a scene from the past, Tonegawa is taken to a Teiai underground casino to play pachinko against the "Bog" an unbeatable machine. However the machine has been rigged in his favor, and although the casino manager, Ichijö Seiya acts horrified that the casino is losing, he demonstrates that all of the controls can be set to achieve the desired outcome for Teiai. Meanwhile foreman Ötsuki and his assistant, Numakawa, have one-day outside pass from the subterranean labor camp, and use the time buying snacks to replenish the stock in their underground shop...