You guys might know Sizzler, a famous restaurant franchise! There are a few in Japan too. The one I just went is in Shinjuku. I would recommend you to go there on weekdays and order a 1,300-yen lunch set. You’ll get 2 plates and you can fill them with as much food as you can from the salad bar, which is full of tasty and healthy salads, fresh and nutritious veggies, and also different ingredients for DIY tacos! You can choose some bread and pasta as well. You can also get 2 cups of soup, 2 glasses of drinks, and a small cup for dessert! If you are in the mood to indulge in heaps of veggies, please go there and your belly will thank you soooo much! xxx Check out the link by clicking the photos!
PS: a great place for birthday party, girls talk sessions, hangout in the afternoon, reading-by-yourself place