Hanabusa Seki is Tobari's 40-year-old live-in lover. She is a paleontologist and is often away on work-related business. She knows that Tobari is a ninja, but she does not understand any of the details about Nabari because he has not told her. She has saved Yoite's life in the past and acts like a surrogate mother to both Yoite and Miharu. She is one to take action and will meddle in other people's affairs when they are too shy or afraid to take any action on their own. She often says what comes to her mind without any prior explanation.
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