Kawasuki was a normal Japanese high school student who has an aptitude for firearms and thinks life is a joke. Tsuri is a swordsman who is a member of warrior clan that she is forever tied to. With the advent of the apocalypse caused by the hands of extraterrestrials, the greatest gunner and the greatest swordsman have to team up to survive and get revenge on a corrupt businessman that wronged them while attempting to enjoy their lives on the way.