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.
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(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

Akuma no Riddle

Riddle Story of Devil

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Riddle Story of Devil

Akuma no Riddle