Dr. Narzenkop, a scientist in the "Republic of Cosmopolitan," has spent 15 years developing a new weapon, an air bomb. The air bomb is a dangerous weapon that causes a chain explosion of the air. The Republic of Cosmopolitan decides to carry out a test of the air bomb to show off its destructive power to their potential enemy, the Republic of Eurasia. A small island on the Pacific Ocean, Konatahan (code name "X-point"), has been chosen as the testing ground. Meanwhile, in Cosmopolitan, there is a man named Sam who leads a reclusive life. Although he was once a gang leader called "Subway Sam," he has turned over a new leaf and is living with his wife and son, Eric. Sensing an impending crisis, he calls up his old comrades to abduct Dr. Narzenkop. (Source: Tezuka Osamu Official)