Akuma no Riddle
The story is set at Myoujou Academy, a private girls' boarding school. The 10th year's Kurogumi class has 12 assassins with their sights on one target, Haru Ichinose. Tokaku Azuma is a recent transfer student who is also targeting Ichinose, but she gradually develops feelings for Ichinose.
(Source: Anime News Network)
Episode 1 - The World is Full of ___
Episode 2 - What Dwells In Your Heart?
Episode 3 - What's Red, But Isn't Red?
Episode 4 - What Comes Suddenly and Never Leaves?
Episode 5 - How Do You Get A Bird Out of Its Cage?
Episode 6 - Every Pretty Flower Has Its ___
Episode 7 - What Can You Never Outrun?
Episode 8 - Which Gatekeeper Is the One Who Lies?
Episode 9 - What Dwells In Your Heart? (Make-up Test)
Episode 10 - Who Is the Queen?
Episode 11 - How to Tell Apart a 'Felicitation' From a 'Curse'
Episode 12 - Therefore, the World is Full of ___
Episode 13