Flower Comics
"7 Seeds" was written and illustrated by Yumi Tamura and published by Shogakukan. It began serialization in the November 2001 issue of the monthly "shōjo" (aimed at teenage girls) manga magazine "Bessatsu Shōjo Comic"; in April 2002, it transferred to the monthly "josei" (aimed at young adult women) manga magazine "Flowers". The final chapter was published in the July 2017 issue of "Flowers", released on May 27. Shogakukan collected the individual chapters into 35 bound volumes, printed under the Flower Comics imprint, and later, under the Flower Comics Alpha imprint. 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.