She seemed to have on clothes from our world, so I think they at least got the key back.So did they got their key and panties back
It's the classic: strong villain dies in one chapter, a few chapters later they're back because dying just makes them smaller and powerless.What I understood is: Kid is depressed and became happy again after his "friend" returned as a small child.
Iirc the key was purchases by a local noble so they went into the dungeon to trade get loot to trade for it. I'm guessing off screen they traded back.So did they got their key and panties back from the interdimensional monkey?
Also the author note, the kamina resemblance isn't just in my head now. It's totally on purpose.