My boyfriend and I hit this restaurant fairly late while visiting Kyoto last October and were happy to find it still open and serving food.
The prices are a little high, but still very reasonable.
We started with the very small ratatouille appetizer, which was delicious; we would've both been happy to snarf large bowls of the precious stuff. Then we each ordered the "tofu steak", which comes with avocado and mushrooms on top and is in a soy-based sauce. If you order this, please be sure to clarify that you want it "vegan", or else they will add oyster sauce to the already-perfect marinade.
Neither of us can explain why this was so good, because we've had plenty of other things like it over the years, but it was. It was amazing. We ended up sharing three portions of it. It came up in conversation the other day, and we both went, "Oh yeaaah, that!" wistfully, recalling the flavourful little gem of a memory and looking forward to returning sometime in the not-too-distant future.
The wee portion of ratatouille we'd shared before randomly achieving peak spiritual tofu awareness was smaller than normal, because the restaurant was going to close soon, and the owner had made sure we were aware of this. He clearly felt quite bad about serving it, even for a discounted price, and brought us each a cute little scoop of their house mango gelato when we'd finished ravaging his bean curd.
It was a lovely experience and we'll be going back more than once the next time we're in Kyoto.
Cons: Predictably small Japanese portions