Incidentally: "magic" mirrors are a thing in Japanese culture, and I think a couple of other cultures as well. Certain metal alloys have a property that if they are heated to the point of softening, and then struck, the surface which is struck will instantly harden. So if you make a plate of metal, chisel a design into it, and then polish the other side, the polishing will wear the soft parts away very slightly more than the places which were hit by the chisel. The difference is not visible when the surface is used as a mirror, but if you use it to reflect light, the very slight difference in the surface will make the reflection have a pattern in it. So that thing on the last couple of pages is not just made up. (They'll probably explain it in the next episode, but then again they might not since it is a Japanese cultural thing.)
(I know about this because there's an old Dr. Thorndyke mystery story about it, The Magic Casket.)