Yoshinobu Yamada's Satanophany is a dark, action-horror seinen manga centered on Chika Amagi, who is imprisoned on Haguro Island for "Medusa Syndrome" and subjected to experiments designed to create elite killers. Chapter 191 continues this narrative following the series' transition to Yanmaga Web for serialization, which now hosts original, weekly "raw" updates. For further information, visit the official Yanmaga Web .