I'll be spending a few days in these cities, and I'm wondering if anyone can recommend any restaurants with a very narrow focus or specialty. One of the things that intrigues me from what I've researched so far is how entire restaurants will focus, e.g., just on tonkatsu, tempura, or what have you. I've already flagged some places for ramen, tonkatsu, sushi, izakaya experience, kaiseki, and soba. I still need to research other stuff, maybe yakitori, teppanyaki experience and/or wagyu beef in general, and I'm sure I'm not even scratching the surface! More generally, as an adventurous food lover visiting Japan for the first time, what kinds of weird and wonderful foods am I in danger of missing out on? E.g. I'd never have known to look out for deep fried eel bones w/out seeing the recent post here.