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In 1945, Nazis plans to build their invincible army. Two Japanese and German scientists, Dr. Asagumo and Dr. Engel, develop a drug, Big X, for Nazis. By injecting Big X, all living things can be as strong as steels and as big as tall buildings. Both Dr. Asagumo and Dr. Engel hide Big X from Nazis and are killed by Nazis. 20 years later, Dr. Asagumo's grandson, Akria Asagumo, fights against the secret Nazis organization by using the power of Big X.