Tony Stark, the CEO of a major weapons manufacturing company, a physicist, engineer, and brilliant inventor, is injured by shrapnel from one of his own creations. While being held hostage by terrorists, he creates the Iron Man Suit and makes his escape. From that moment onward, he swears not to squander his second chance at life and to improve the world. To accomplish this, he travels to Japan.
At Lab 23 in Japan, significant progress has been made in developing and constructing a unique power station that does not rely on fossil fuels—the Arc Station. Stark intends to participate in this project, and to that end, he is prepared to announce his retirement as Iron Man. Simultaneously, he will also unveil the Mass-produced Iron Men, to whom he will delegate his responsibilities. However, during the ceremonies, Stark is suddenly attacked by combat mecha belonging to an organization called Zodiac.