Years after a great war was waged between the portion of humanity that migrated to Mars and those who chose to remain on Earth, a tentative peace has been struck. But not everyone is happy with the status quo. When the Princess Asseylum of Mars makes a diplomatic visit to Earth in an effort to strengthen ties, some see it as an opportunity to reignite the flames of war. Can the citizens of Earth stand against the awesome might of the Martian Kataphrakts a second time? 
(Source: Yen Press)

Seeking for revenge, Count Saazbaum, a Martian, attacked the Earth. Later on, the war between the Terrans and Martians ended with Earth's Terrans gaining the victory. However, nineteen months later, the battle between them continues. Martians still continues to invade the Earth and the Terrans to protect it.
 
(Source: Anime News Network)

Around the same time Slaine and Trillram went down to New Awara where Inaho and the others were, up at Sapporo, Hokkaido, twin Martian Knights sisters who pilot a Kataphrakt unit from the Vers Empire were landing in the town where the twin siblings Mizuki and Haruya Mikage live...


In 1972, the Apollo 17 mission found a hypergate to Mars on the surface of the moon. Upon landing, astronauts discovered a enchanted utility later referred to as 'Aldnoah', giving the astronauts a status of superiority. Soon, many humans have relocated to Mars, and have adapted to the name 'Martians'. After Princess Asseylum, a royal Martian princess, descends onto Earth in an attempt to create a treaty between both planets, a war breaks out between Earth and Mars, and Martian soldiers begin to descend from the sky, riding steel giants, intent on exterminating humanity.
 
(Source: Anime News Network)

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