Torture Dungeon – Kannagi Volume (Tanaka Naburu)

In a torture dungeon, the broken, limbless goddess sisters Kannagi and Nagi are bound to a triangular horse and forced into sadistic competition games involving suspension, barbed wire, and semen-drinking races, with losers subjected to brutal gang-rapes. Their captors mock their agonized cries and decide to encase them in cement as permanent "toilet gods," noting that only their eyeballs remain as potential future targets. This December 2008 doujinshi by Tanaka Naburu, under the circle Harmful Book Project, depicts the ongoing depravities and the sisters' complete degradation.