Aquarian Age Saga II ~Don't forget me...~

Earth still recovers from the damage by the attack of the evil Erasers (aliens) who have only been defeated by the combined forces of the four hidden magical tribes amongst mankind who've been battling for control over earth - Arayashiki (eastern mages), Wiz-dom (western mages), Dark Lore (demi-human monsters), and E.G.O. (evolutionary gender organization = super-humans). In the aftermath, Earth is placed under the unified rule of the Polestar Empire (invaders from a different universe), beginning to use forbidden magic. These dark powers cause dimensional rifts around the world and once again plunge Earth into chaos and warfare. So four selected fighters, one of each tribe each, have to protect humankind once more.

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[OVA, 2003, 1 episode, 58 min, based on a trading-card game; see also: Aquarian Age]