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Four years later, people in Mikado City have grown used to the occasional battles with the Neighbors, and have returned more or less to their everyday lives. Border has become popular. One day, a mysterious white-haired student named Yūma Kuga (空閑 遊真, Kuga Yūma) transfers to the local school. Kuga is actually a strong humanoid Neighbor, a fact that he wants to hide from Border. In the school he meets another student, Osamu Mikumo (三雲 修, Mikumo Osamu), who is secretly a C-rank Border trainee. Since Kuga is completely oblivious about life in Mikado City, it falls to Mikumo to guide him through it, and to prevent him from being discovered by Border.

(Wikipedia)

In 2191, Earth made first contact with aliens called Gamilas. The first attempt at peaceful contact with the Gamilas failed, resulting in interstellar war. The United Nations Cosmo Navy, though outmatched by the Gamilas’ space naval forces, was able to stop their direct assaults on Earth in the Second Battle for Mars, though it suffered heavy losses in the process. The Gamilas then began bombardment with modified asteroids called planet bombs. These bombs hampered the efforts to rebuild Earth's space fleet and forced Earth to construct underground cities to protect humanity. The bombs altered the atmosphere and irradiated the planetary surface, causing the complete destruction of the planet's biosphere. But in early 2198, Starsha, from the planet Iscandar, learned of Earth's situation and dispatched her sister to Earth. She brought with her the designs to the Dimensional Wave Motion Engine, providing interstellar flight along with other technological assistance to Earth.

(Wikipedia)

In an alternate 1972, during the Apollo 17 mission, an ancient alien artifact named the "Hypergate" was discovered on the surface of the Moon, allowing for near-instantaneous travel to and from Mars and the colonisation of Mars. After settlers discover additional alien technology on Mars (dubbed "Aldnoah"), they declare independence from Earth to found the Vers Empire. Later, the Vers Empire declares war on Earth, and in 1999, a battle on the Moon's surface causes the Hypergate to explode, shattering the Moon and scattering the remnants into a debris belt around Earth. Cut off from Mars, the remnants of the Vers Imperial Army establishes several massive orbital space stations within the debris belt and a ceasefire was established. 15 years later, in 2014, an attack on the First Princess of Vers during a diplomatic mission to Earth causes the Empire and its 37 clans of Orbital Knights to launch a new attack on Earth, this time determined to conquer it once and for all.

(Wikipedia)