I tried to find the restaurant the other day, but it was impossible to find, I walked around the streets for about 20 minutes and asked two locals, including some one running an organic wine bar, but I did not succeed (however, I do not speak Japanese).
I ended up at an Indian restaurant called Nanak, which was vegetarian friendly as well.

When I visited in this restaurant in June of 2012, everything was vegan & they had created an English menu. Everyone was friendly, and I was given a free sample of some kind each time I visited. The "crab" cakes are ridiculously good & they sell a few things like pasta & baked goods. The low lighting & calm music (artists like Bob Dylan & Norah Jones) make it a very relaxing atmosphere.

Although meat & fish are on the menu, they cater very well for vegans and I don't think they use eggs. I had the lentil curry which was very tasty. I couldn't make my mind up which cake to have, so they gave me half a slice of each served up with a tasty soya cream and green tea sauce. It is also in an interesting area called Tenjin not far from the centre. Opening hours:11:30-15:00 & 18:00-22:00.