Spiral

Spiral (aka Spiral: The Bonds of Reasoning) is a manga illustrated by Eita Mizuno and written by Kyou Shirodaira.  It's essentially a mystery series where the main character is trying to find his older brother with his only clue being the mysterious "Blade Children."  The manga also got a spinoff/prequel called Spiral Alive, also done by Mizuno and Shirodaira.

I really like the artwork for this series.  Mizuno has done two artbooks with illustrations from this series and they are quite nice.  Most of the art in today's post is drawn from those artbooks.

Spiral: The Bonds of Reasoning is currently available in the U.S. from Yen Press.  There is also an anime version of this series and it's available in America from Funimation.