I made a special trip to Tokyo station just to get vegan ramen, and it was worth it. I had the miso ramen, and while not the best ramen in the world, it was really good, it tasted just like I remembered ramen should taste. I also had a side of smile curry, which I found disappointing, and did not taste the way I remembered a Japanese curry should taste.
The next day, I dragged my friends back for another round, because I'd spent my whole Japanese trip craving good Ramen, and I wasn't going to leave without having another bowl. This time I had the shoyu (soy sauce) ramen, with a side of the eggplant dish. I think the miso was better, but both were very good. My friends enjoyed theirs also. This time we had spent the day in Akihabara. We bought tickets from Akihabara to the station near our hotel, but then got on a train going in the other direction to Tokyo instead (only 2 stops), had our meal, and then caught the train back to our hotel. Because the restaurant is inside the station gates, we didn't need to validate our tickets at Tokyo station, and so our little detour didn't cost us anything extra.
Both times, we had to queue for a bit before getting a table, but the wait wasn't too bad.
Cons: A little bit expensive, Had to queue for a table