should be hiragana bc its a native word but... /shrug
English
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It should be in Kanji ( 伊弉冉尊 or 伊邪那美命 ) because its a name not a word and because of the age of the myth.
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at least I'm 98% sure
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I just Google translate.
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I can back it for whatever it is worth, because that's what I was thinking.