Smokyo

Probably the best vegetarian restaurants has to be “It's Vegetable” in Kinshicho.

Importing most of its fare from Taiwan you can get a whole range of vegetarian food with some witty translations ("intestine filled with vegetarian diet" (veggie sausage), for example).

All foods are 100% vegetarian (something the owner takes great pleasure in explaining to customers) but not all the dishes are vegan. There is a buffet all you can eat lunch which is 1500 yen. A little pricey (except for the reasonable priced beer) but definitely worth a visit.

Turn right out of the North exit of Kinshicho Station (on the Sobu line). Walk down the street following the tracks. Cross the main street. It's on the right.