Flower Comics
Shogakukan collected the individual chapters into 35 bound volumes, printed under the Flower Comics imprint, and later, under the Flower Comics Alpha imprint. The first volume was released on 26 March 2002; the last volume was released on 10 August 2017. Each volume was divided into sections focusing on different groups of survivors, with section titles containing a "kigo" (seasonal word) appropriate for the group name. Shogakukan also published an official fanbook, titled "Edge of Emotions", on 9 December 2011. The fanbook contained detailed character profiles, a color illustration gallery, and a long interview with Tamura.