I have found an article about Vegetarian friendly restaurants in Japan at Japan Travel Forum of Tripadvisor. Lacto-ovo vegetarians, Ovo-Vegetarians,Lacto-Vegetarians and Vegans.
For Pescatarians, there are still some options to eat in Japan.
Shojin-ryori(精進料理) is a vegetarian meal prepared for Buddhist monks in 8th century.Following the Buddhist prohibition on taking any life, it contains no fish or meat. The soup stock ingredients are soybean, kelp, dried shiitake( mashroom) and gourd.
Kaiseki Ryori(懐石料理) is the meal served prior to a tea ceremony. Currently Kaiseki Ryori would be served fish or meat.
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