My suggested method is to install the KoboTouchExtended plugin in calibre, then re-send the book. The the books are sent that way, (converted on the fly to what we call Kepub,), Kobo will automatically fall back to a different font if the glyphs it needs are not in your current font.
Otherwise, while reading the book you have now, try sithing to one of the Kobo Japanese fonts. I think the "Kobo Tsukushi Mincho" would do it.
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