Trying SEVEN ELEVEN Japan Convenience Store Food 

I also like the bentos as well, they are all tasty.

I believe most of the regular convenience stores in Japan like seven eleven don`t have much vegetarian dishes. You maybe able to get like a plain salad and such but not much else. However, from what I heard, Natural Lawson, a different branded chain, part of Lawson group, does carry more vegetarian dishes.