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This is a special form of hell you've found yourself in, looking myself I could only find that it exists.
You'll have to find this on your own, if you're really autistically obsessed with it I'd recommend getting in touch with a Japanese contact if you haven't progressed after another 100 hours, even if they're not the most knowledgeable or dedicated being able to read and pull from Japanese sources is likely to bring something up.
I recommend sharing what you've found so far as well.