Went for the all-you-can-eat dinner buffet. Many vegetarian and vegan options the owner clearly marks for you with colourful post-its. Owner understands vegetarianism and veganism well, and will check again what you do and do not eat before he marks the dishes. Owner knows of bonito flakes and fish broth and will not mark dishes with such ingredients as veggie. So you can safely stuff yourself with lots of veggie foods! Go with an empty stomach. There were about 10 vegan options when I went. Always vegan curry available.
You have to pay separately for dessert (except for ozenzai), but we got it on the house!
Cons: Not completely veggie resto, Pay extra for dessert