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Japan builds a large space power plant called Saint Elmo in the planet Mercury. The plant supports Earth with its large solar energy supply, but, when there is an abnormality at the plant, Earth has to send several technicians to fix the problem.
The story is set in the near future not long from now, when humanity has completed an orbital elevator and begun developing the outer planets in earnest. An enigmatic extraterrestrial enemy known as "Obliquus" has set its sights on the solar system, and humanity enters a state of war with the first aliens it has encountered. To counter the enemy's overwhelming technological superiority, the Khronos Foundation has assembled the descendants of every country's heroes from Japan's Musashi Miyamoto and Ryōma Sakamoto to France's Napoleon and Joan of Arc. The foundation then fuses the descendants with "Gear" battle suits as special biological weapons, thus giving birth to "Khronos Gear."
In a peaceful, disarmed world where small robots are utilized as housekeepers, villains act with huge robots instead of weapons. Dr. Keewee converts Michael’s robot into a transformable one in order to teach them a lesson. This is the birth of Galatt, the town hero.