The beautiful Azami is tired of her penniless and lazy boyfriend, Hideji. Determined to break up with him, she must first get back all the money she has given him over the years. She hatches a plot in which she fakes her own kidnapping to get Hideji to pay a ransom. Things get hilariously complicated when all parties involved act to their own agendas.

When military experiments go haywire and trigger an atomic bomb, the consequences are of epic proportions. A monster arrives in the midst of the nuclear fallout, and Japan's defenses are helpless against it. Mankind's only savior is an irradiated water goblin from Japanese folklore called the "Death Kappa." The two rival monsters must go head-to-head in the ultimate battle between good and evil!