The first of four light novels, all illustrated by Junji Goto, was written by Ryuna Okada and printed by Harvest Publishing under their Harvest Novels imprint. Released on December 1, 2005,  retells the original story from the perspective of Sekai.
The initial of a series of four light novels, illustrated by Junji Goto, was written by Ryuna Okada and published by Harvest Publishing under their Harvest Novels imprint. It debuted on December 1, 2005, and retells the original story from the viewpoint of Sekai.