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Riddle Story of Devil.
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)
12 aired or completed episodes listed in the metadata. Video availability can vary by episode and provider.