Demon Bane originally came out as an adult PC game back in 2003 but since then has made it to books, the PS2 and now anime. The series features cute moe girlies and huge chunky mechas - what more could you want from an anime series heh?
The anime series starts airing on WOWOW on the 18th May and you can get a glimpse of the action by watching the trailer at the official site.