Mumbai is an indian restaurant near the station Yotsuya. If you go during lunch time you can get two vegetarian curries (daal and vegetable curry), a little salat and all-you-can-eat rice and naan (indian bread) for 1000¥!! It is really good and a lot! If you are a student you even get a lassi for free :) .
〒160-0004 Tokyo, Shinjuku, Yotsuya, 1 Chome−8−6