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Ritsuka Tachibana has always been a good student, so she is completely shocked when she is suddenly summoned by the student council. And that's only the beginning; from there, her life is turned upside down as her mother gets kidnapped and Ritsuka gets drawn into a world of vampires and devils. Both groups are searching for the "Grimoire," a forbidden item allowing its owner to rule the world. (Source: IMDB)