I'm going to repeat what I said on the Q&A thread, word for word:
Dark Deceiver wrote:You have GOT to be kidding me. You're at Kyoto, at level 34, and you're still using the Oni's Dagger? Let me guess, you were carried there, without ever actually grinding on your own, right?
In any case, if you haven't raised her friendship level by giving her Friendship Pendants, there's your problem. Click on Story, then Partners, and when you see your partners menu pop up, click on the heart with the + next to it.
It's that simple, and unless you skipped all the dialog at the beginning, you should have known this and done it already, meaning you would have been able to ID weapons, especially at Kyoto.
Also, here's a free tip to help you: Don't leech, grind on your own, it'll benefit you better.