Spiral: The Bonds of Reasoning

Spiral: The Bonds of Reasoning is a Japanese manga series written by Kyo Shirodaira and illustrated by Eita Mizuno. It was published by Enix and then Square Enix in Monthly Shōnen Gangan from 1999 to 2005 and collected in 15 bound volumes. The series focuses on Ayumu Narumi and his efforts to solve the mystery of the Blade Children, cursed geniuses with cat-like eyes lacking a seventh rib bone. A prequel series, Spiral: Alive, was published in Gangan Wing and Monthly Shōnen Gangan from April 2004 to June 2008 and collected in five bound volumes. Yen Press acquired the license for Northern American release, and published the series from October 2007 to April 2011.

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