Spiral: The Bonds of Reasoning was adapted into a twenty-five episode anime series by TV Tokyo. It premiered on their channel on October 1, 2002 and ran until March 25, 2003. FUNimation acquired the Region 1 license for the series and released it to DVD. FUNimation also aired the series, in dubbed format in their FUNimation Channel programming block on CoLours TV from June 19, 2006 until August 22, 2006. The anime series, however, is incomplete, covering only part of the manga and having concluded production before most of the mysteries were solved.
Ayumu Narumi's older brother Kiyotaka, a famous detective and pianist, disappears without a trace. The only clue as to his whereabouts is the "Blade Children", the only words Ayumu managed to catch in a final phone call from Kiyotaka. Two years later, a row of murders and incidents begin, all related to the Blade Children. Together with the infamous (and only) school journalist, Hiyono Yuizaki, Ayumu tries to figure out their destiny and the mystery shrouding their past.
info credited to wikipedia.org
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bitin because of that hanging conclusion about what's gonna happen next to the blade children which i believe are the focal point of the story.. but none the less, story is good.. ^^