"Mole" is his name for himself - others tend to call him "Pig". He is, quite literally, an underground man. He has turned a vast abandoned subterranean quarry into a computer-equipped, gadget-bedecked, electronic-age "ark" capable of surviving a nuclear war. Now he is looking for "passengers" to join him in his bizarre haven.

For all his careful planning, Mole soon finds himself at the mercy of a con man and his sakura, or shill, along with the shill's pretty young associate (who is probably also a shill). Life in the ark becomes complicated - by sex, by intruders, and by critical malfunctions in the ark's own machinery (the centerpiece of which is an extremely powerful toilet, capable of flushing just about anything - including people - out to sea).