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Part of the game company and former doujinshi circle [TYPE-MOON](https://anilist.co/staff/97582) and younger sister of [Shinichi Yuuki](https://anilist.co/staff/100211). Eri Takenashi is the original author of the Kannagi manga. She has a few cameo appearances in several episodes of the Kannagi anime, such as ep. 5.