[Machine Translation] A single female office worker was slaughtered with an Izumo sword in an apartment in Nara, Japan. The only clue to the locked-room murder is a strange pattern left on the wall. The same pattern was found at the scene of a hit-and-run accident that occurred two weeks earlier. Suspecting a connection to the Izumo Shinryu, a ninja group that existed long ago, Takashi Kuwabara and Nana Tanahata visit the scene of the crime. The abominable truth about ancient Izumo is revealed.