It is two hundred years after the beginning of the Space Era, when human civilization on Earth began expanding into space. However, by the start of the 21st century, two meteors struck the planet, sending humanity into chaos. By the year 179 of the Space Era, secret technology, dubbed Extra-Over Technology, or EOT, was discovered by the Earth Federal Government within a third meteor that hit Earth in the Marquesas Islands of the South Pacific. Dr. Bian Zoldark, head of the EOTI Institute (Extra-Over Technological Investigative Institute), had evidence the creators of the EOT were heading to Earth, in order to reclaim it...or worse, invade the planet. In order to defend humanity from extraterrestrial threats, the government begins to research and develop humanoid mecha called Personal Troopers.
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(Source: Anime News Network)

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Seigi no Heroine Kangoku File Vol. 15