Aldnoah Zero

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...

An anthology of Aldnoah.Zero by various mangaka.