"I'm going to uncover the mystery of the Blade Children."
World-class detective Kiyotaka Narumi's last words prior to his sudden disappearance continue to haunt his younger brother, Ayumu. The cheeky tenth-grader becomes further embroiled in the mystery when he is mistaken for the prime suspect in a murder at his school. Led by Ayumu's sister-in-law, Kiyotaka's wife and fellow detective, Madoka, the investigation into the murder gives Ayumu a chance to clear his name. But in doing so, he not only uncovers ties to the Blade Children but also more questions than answers about who and what they are.
- Release Date: October 17, 2007
- ISBN: 978-0-7595-2341-8
- Content Rating: T Teens Age 13+
- Manga Genres: Shonen (Boys') Manga, Action / Adventure, Mystery / Suspense, Anime Tie-In
- Read a review of Spiral: The Bonds of Reasoning Volume 1
- Compare prices for Spiral: The Bonds of Reasoning Volume 1

