Adapted from the novel "The Decagon House Murders" by Ayatsuji Yukito.
All the nicknames used by the characters who are members of the Kyoto Mystery Club are based on the most famous mystery writers. These include Arthur Conan Doyle, Ellery Queen, Edgar Allan Poe, S.S. Van Dine, Agatha Christie, Gaston Leroux, John Dickson Carr, and Baroness Orczy.