Viz just released this manga in an English edition. I believe it originally was publish in Gangan (The Square-Enix manga anthology that prints FMA among other stories). The original Japanese title for this story is "666 Satan" so you can probably understand why Viz decided upon a new name when bringing it out here in the USA.
The story is basically about a boy w/ split personality and his hunt for superior weapons, questions about his past, etc.
One of the things that make this so interesting is that the artist/author is Seishi Kishimoto the twin brother of the guy who created Naruto!
If you get a chance to see the manga you'll most likely be amazed at the similarity in styles that the brothers share.
Link to Gangan for those who've never seen it:
http://gangan.square-enix.co.jp/
Link to Viz's US site:
http://www.viz.com/products/products...roduct_id=6145
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