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Well. renka is a bit of an unknown quantity as far as we know. The only reference we have of her is her fight with rachel however we also do not know where exactly she stands in terms of strength. If rachel is comparable to the other yomi then miu would win quite comfortably though. Of course, it could turn out that rachel also is quite strong for her age and thus an actual match for miu.... rachel is older than eithe renka or miu after all.