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Kei's given name is variably spelled in katakana as ケイ (Kei), or with the kanji 兄 (Kei). The latter, which is typically pronounced ani, is the kanji for "older brother," and serves as a contrast to his younger brother Dai (弟) whose first name means "younger brother."
An ordinary boy who was unexpectedly informed by yokai that he is the descendant of the samurai Watanabe no Tsuna, who was the strongest yokai hunter 400 years ago. He is suddenly wrapped up in the fight to save Japan from crisis. Though he puts on a brave face, he is considerably timid.
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