A man named Lee Jung-yool appears out of nowhere in Han Gitae's detective agency, and Gitae suddenly finds himself under threats to cooperate with his plans...! What exactly is the massive conspiracy that in...

The manga based off the best-selling The Decagon House Murders novel by Yukito Ayatsuji! The members of a particular university’s Mystery Club travel to a ten-sided house on a remote island…which just ha...