In this world, "Index" is a young nun who has 103,000 forbidden magical texts (grimoires) implanted in her mind. Because these books are considered "taboo" and dangerous to the average human, she is a walking, talking "Index of Taboo."
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The central drama explores the conflict between following an unjust "index" and acting on human morality. When the system fails to prevent a sexual assault, one hero breaks the Taboo Index to protect the innocent, sacrificing himself in the process. The story powerfully illustrates how any "index of taboo" is only as good as the moral principles it enforces—and what happens when those principles fail. index of taboo