Check out an interesting blog site http://japanvegan.blogspot.jp/
This blog site provide some basic starting information for vegans travelling to or living in Japan.
Note from the blog owner about the vegan blog site
The purpose of this blog is to provide useful information to vegan travelers or residents, and as such, I will aim to make the information as practical as possible. However, due to the size of Japan - and even Tokyo - this blog will never be complete, especially considering how quickly restaurants come - and unfortunately go - in Japan. However, since my 'Japan' posts on my Taiwan blog are becoming longer and longer, and since there is little (up-to-date) information out there on vegan options in Japan, it seems worth putting together this short blog while I am here.
Click here to learn about Vegetarian Indian Restaurants in Tokyo
Hope you may find this information useful