I think Fumiko herself has to be a human, since if she wasn't she wouldn't be able to make contracts with other Devils like Aging and Octopus. As we saw with Santa Claus in part 1, humans can make contracts with Devils that allow them to have more than one body (or in the case of Santa Claus create-
a hive mind, as Santa Claus wasn't the Puppet Devil but a human who had a contract with the Puppet Devil). So perhaps the Devil Fumiko has a contract with allows for some kind of weird multiple body shenanigans.
Her making a contract with Aging is probably the best evidence that she's human. The way she talked also made it seem as if both Fumikos were the same person rather thannsome sort of fusion like Asa and Yoru, but I also feel like it's not as simple as just a regular contract.
I dunno, a “regular” contract is a pretty broad category. As we’ve seen in the series, a regular contract is capable of a lot of weird and different things (like Santa Claus’ contract with the Puppet Devil).
The prior line of dialogue implies that she’s human… at least I think she’s the one who asked aging if they’re tired of human flesh… been a long time since I been this confused after a chapter.
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Another possibility is that this is an Asa/Yoru type hallucination talking to Aging which raises even more questions.
Dunno which
The Devil