Ayaka Suwa, Hisako Kanemoto Star in Akuma no Riddle Anime

The official website for the television anime adaptation of Yun Kouga and Sunao Minamikata's Riddle Story of Devil (Akuma no Riddle) manga revealed the show's main cast on Monday. The site also revealed that the series will premiere in spring 2014.

The main cast is as follows:
Ayaka Suwa as Tokaku Azuma
Hisako Kanemoto as Haru Ichinose
Yoshino Nanjou as Nio Hashiri
Azumi Asakura as Isuke Inukai

Additional cast members include:

Fumiko Uchimura as Haruki Sagae
Mami Uchida as Hitsugi Kirigaya
Sachika Misawa as Chitaru Hamatame
Yuka Ōtsubo as Mahiru Banba / Shinya
Miho Arakawa as Sumireko Hanafusa
Haruka Yoshimura as Kōko Kaminaga
Chika Anzai as Suzu Shutō
Manami Numakura as Otoya Takechi
Yuki Yamada as Shiena Kenmochi
Tomokazu Sugita as Kaiba-sensei
Takahiro Sakurai as Mizurogi-sensei

The website also revealed additional staff members:

Scripts: Masahiro Yokotani, Ayuna Fujisaki
Supervising Director for Weapons and Hand-to-Hand Fighting: Akira Otsuka
Action Director: Takayuki Sano
Color Key: Ryota Nakada
Art Director: Masatoshi Muto
Director of Photography: Yasuyuki Itou
Editing: Toshihiko Kojima
Sound Director: Yoshikazu Iwanami
Sound Production: Dax Production

The story is set at Myōjō Academy, a private girls' boarding school. All the students in the 10th year's Kurogumi class are assassins with one target, Haru Ichinose. Tokaku Azuma is a recent transfer student who is also targeting Ichinose, but she gradually develops feelings for Ichinose.

Keizou Kusakawa (Magical Girl Lyrical Nanoha A's and Magical Girl Lyrical Nanoha films, il sole penetra le illusioni ~ Day Break Illusion, Ro-Kyu-Bu!, Sekirei) is directing the anime at Diomedea. Kiyoko Yoshimura is in charge of the series scripts, and Naomi Ide is serving as the character designer and chief animation director.

Story creator Yun Kouga and artist Sunao Minamikata launched the manga in Newtype last September, and Kadokawa published the first compiled book volume in July.