Gate Keepers 21

Thirty-two years have passed since the initial defeat of the Invaders. A.E.G.I.S is all but dismantled now and has become an underground organization consisting of only a few Gate Keepers left to save humanity. One of the members, Ayane Isuzu, is sick of society as a whole, though she continues to defeat the Invaders out of spite for her father. Suddenly, she learns of the revival of Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl now accompanies them. It is up to Ayane and the remnants of A.E.G.I.S to stop them and save humanity once again. (Source: ANN)

Type: OVA
Rating: PG-13 - Teens 13 or older
Season: None None
Status: Finished Airing
Read more: MyAnimeList (MAL)
Studios: Gonzo
Genres: Action Sci-Fi Drama
Tags: action sci fi sci-fi science fiction contemporary fantasy fantasy magic school life mecha shounen super power superpowers drama aliens