Sousei Kishi Gaiarth
Genres: Action, Adventure, Fantasy, Sci-Fi
Type: OVA, Episodes: 3
Aired: Apr 22, 1992 to Apr 28, 1993
Studio: AIC, Studio Kyuuma, Big Bang
Source: Original
Rating: PG-13 - Teens 13 or older
Synopsis:
Gaiarth - a world devastated by a cataclysmic war, where pockets of humanity struggle to survive amidst the wreckage of technologies made magical by ignorance. 

Gaiarth - a world where artificially intelligent machines doggedly pursue their programmed imperatives: to protect, or destroy, humanity. 

Gaiarth - a world in which an old and terrible evil has reawakened, threatening to once again bring forth Armageddon!

(Source: AniDB)