Small Riddle of Evil by Minakata Sunao and Morishima Akiko Akuma No Riddle Doujin — Ongoing
Also known as Koakuma no Riddle
- Volume 1
- Chapter 1 by Minakata Sunao released Jan 6 '15 Art book Comedy Lots of kissing
- Chapter 2 released Sep 20 '15 Art book Comedy
- Chapter 3 released Feb 18 '16 Art book Comedy Kouko x Suzu
- Chapter 4 released Oct 11 '16 Art book Chitaru x Hitsugi Comedy Full color
- Chapter 5 released Dec 8 '16 Creepy Otoya x Shiena
- Chapter 6 released Feb 6 '17 Action Maid Sumireko x Mahiru x Shinya
- Chapter 7 released Jul 11 '18 Age gap Banba x Sumireko Chitaru x Hitsugi Comedy Haru x Tokaku Haruki x Isuke Kouko x Suzu Nio x Yuri Otoya x Shiena
- Volume 2
- Chapter 10: Room 1 by Minakata Sunao released Mar 25 '21 Drama Haru x Tokaku Romance
- Chapter 11: Room 2 released Apr 4 '21 Haruki x Isuke Tsundere