Akuma no Riddle is a 4-book series with 5 primary works first released in 2012 with contributions by Yun Kouga and Sunao Minakata.
#1 of 5 in Akuma no Riddle
2012 • 1 Reader • 175 pages • 4
#2 of 5 in Akuma no Riddle
2014 • 1 Reader • 4
#3 of 5 in Akuma no Riddle
2014 • 1 Reader • 4
#4 of 5 in Akuma no Riddle
2016 • 1 Reader • 4