Shirodaira and Mizuno also collaborated on the Spiral Alive prequel manga, which debuted in April 2004 and ended in 2008. This manga started in Monthly Gangan Wing magazine before moving on to mainstream magazine Shonen Gangan in 2006. The prequel series reveals more about the mysterious group called Blade Children that first appeared in the main manga and anime series Spiral.
Synopsis
World class detective Kiyotaka Narumi's last words before his sudden disappearance continue to haunt his younger brother, Ayumu. The tenth-grader is equally embroiled in the mystery of the convicted "Blade Children" when he is mistakenly called the primary suspect in a murder at his school. Led by Ayumu's sister-in-law, Kiyotaka's wife, and her fellow detective, Madoka, the murder investigation gives Ayumu a chance to clear his name. But in doing so, you discover not only ties to the Blade Children, but also more questions than answers about who and what they are.
Sources: Gangan Online's Twitter account, Comic Natalie
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