ALDNOAH.ZERO SEASON 2

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) — Description from AniList community (anilist.co).