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Shibusen, standing for Death Weapon Meister Academy (DWMA) the technical school for Reaper Armsmasters that operates from the deepest recesses of all the corners of the world, in order to prevent the second coming of the so-called Demon God who is feared upon bringing destruction of all humankind and envelop the world with nothing but madness and darkness. The reaper built this agency for weapons and for those who will be trained to wield them.

The series is set in an alternate reality where a new, women-only, gambling sport known as "keijo", quickly becomes a fad in Japan since its introduction in the dawn of the 21st century. Keijo matches are held atop floating platforms in large water-filled stadiums where bikini-clad players fight to incapacitate their opponents or push them out to the water, but they can only hit each other using their breasts or buttocks.