6 Angels

is a Japanese science fiction ova series produced by Ark Trues, where the episodes were individually released between November 20, 2001 to July 6, 2002.

Plot
A group of female mercenaries known as the Rose Guard patrol a Utah nuclear test site that has been overhauled into a penitentiary for hardened criminals. But the prison has been taken over by the Canyon family, and aims to use nuclear weapons to "cleanse the world with radiation". Only the Rose Guard can stop them.

Other Sources

 * MyAnimeList