A prequel series by Shirodaira and Mizuno, called Spiral: Alive, was published in Gangan Wing and Monthly Shōnen Gangan from April 2004 to June 2008 and collected in five bound volumes.
Serangkaian prequel oleh Shirodaira dan Mizuno, yang disebut Spiral: Alive, diterbitkan di Gangan Wing dan Shonen Gangan Bulanan dari April 2004 sampai Juni 2008 dan dikumpulkan dalam lima volume.