According to the anime's official site, "Akuma no Riddle" will be aired in spring 2014. The full staff and cast list are as follows:

Staff
Original Character Design: Sunao Minakata
Director: Keizo Kurakawa
Series Composition/Script: Kiyoko Yoshimura
Script: Masahiro Yokotani, Ayuna Fujisaki
Character Design/Chief Animation Director: Naomi Ide
Equipment/Fighting Director: Akira Ozuka
Action Director: Takayuki Sano
Color Design: Ryota Nakata
Art Director: Masatoshi Mutou
Filming Director: Yasuyuki Itou
Editing: Toshihiko Kojima
Sound Director: Yoshikazu Iwanami
Sound Produce: DAX Production
Studio: Diomedea

Cast
Tokaku Azuma: Ayaka Suwa
Hare Ichinose: Hisako Kanemoto
Nio Hashiri: Yoshino Nanjo
Isuke Inukai: Azumi Asakura
Haruki Sagae: Fumiko Uchimura
Hitsugi Kirigaya: Mami Uchida
Chitaru Namatame: Sachika Misawa
Mahiru/Shinya Banba: Yuka Ootsubo
Sumireko Hanabusa: Miho Arakawa
Kouko Kaminaga: Haruka Yoshimura
Suzu Shutou: Chika Anzai
Otoya Takechi: Manami Numakura
Shiena Kenmochi: Yuki Yamada
Sensei Kaiba: Tomokazu Sugita
Sensei Mizoroku: Takahiro Sakurai

Source: Official site

Previous related topic: Manga 'Akuma no Riddle' to be Animated

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