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A classmate of Takahisa. Often seen with a book. She is secretly the main antagonist of 11eyes CrossOver. She is an extremely powerful witch who has been living for over a century. She is even more powerful than Shiori and is able to call for her koyu kekkai by just a finger snap. She seems to be well aware of the "Red Night" and its purpose, but she avoid letting others besides Shiori knows that fact. She belongs to Thule Society, a group of magical organization created by the Nazi during World War II and consist of seven extremely powerful dark art users to oppose and try to eliminate Index. She has a Kirakishou-Suigintou complex with Liselotte. It's through her manipulation and engineering that send the doppelganger to kidnap and sacrify the victims' live force to the "Artificial Emerald Tablet" inside her mirror Koyu Kekkai. The "Artificial Emerald" is her plan of secret world domination. The "Artificial Emerald Tablet" is created by the sacrified life forces of specific people and would be completed one the ten thousandth victim is sacrified. While under construction, the "Artificial Emerald Tablet" allows her to tune magical power within her mirror koyu kekkai to her own advantage so other people can't activate their sorcery inside it. Upon completion, the effect of the tablet would extend to the whole world and she would basically be able dominate the world since there would be no magus or other sorcery users to stop her. She claims part of the reason for doing this is to prevent Liselotte from destroying the world.

Source: Wikipedia