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1．Amusement & Sports Bar M-SPO 「アミューズメント＆スポーツ バー M－SPO」
Popular lunch deal of all-you-can-eat pizza, salad, soup, curry and desserts with free-flowing soft drinks is offered at M-SPO. The good news is there is no time restriction on weekdays. Delicious pizza baked in genuine stone oven is definitely worth a try.
2F, 12-3 Udagawacho, Shibuya-ku, Tokyo
http://www.m-spo.jp (Japanese only)
２. Moyan Curry 246 Shibuya Shop「もうやんカレー 246 渋谷店」
Plenty of fruits and vegetables like onions, carrots, celeries, apples, bananas, tomatoes, and garlic are blended with 23 to 26 varieties of spices and cooked slowly for more than 2 weeks. That’s a whole lot of TLC put into its curry sauce at Moyan. Lunch buffet is 1000 yen.
Seven Heights 1F, 1-7-5 Shibuya, Shibuya-ku, Tokyo
http://moyan.jp/ (Japanese only)
３. Taverna & Bar ITALIANO Tharros「タベルナ＆バール イタリアーノ タロス」
Tucked behind Shibuya Mark City, this pleasant, Southern Italian restaurant offers extremely popular salad buffet at lunchtime along with your choice of pasta, main or soup of the day.
Shibuya SEDE Bldg. 1F, 1-5-2 Dogenzaka, Shibuya-ku, Tokyo
http://www.tharros.jp/index.html (Japanese only)
4. SHIBUYA DINING Punraku「ＳＨＩＢＵＹＡ ＤＩＮＩＮＧ ぷん楽」
Punraku is conveniently located on the 8th floor of QFRONT, the building facing the famous Shibuya Crossing with Tsutaya. There are around 23 freshly prepared dishes and soft drinks on the buffet counter at all times. And the price is reasonably set considering the location and the quality of food.
QFRONT 8F, 21-6 Udagawacho, Shibuya-ku, Shibuya
5. Tucanos 「トゥッカーノ」takeshikj/Flickr
You might come across dishes you have never tried before at this Brazilian restaurant, so be daring! Churassco (all-you-can-eat grilled meat) combined with salad and dessert buffet are ever so popular at lunchtime but you can also opt for a set meal of single dish of grilled chicken, pork or beef with salad and dessert buffet.
B1F, 2-23-12 Dogenzaka, Shibuya-ku, Tokyo
6. Spicy Spicy 「スパイシースパイシー」
Korean eatery located on busy Shibuya Center Gai. Budget lunch buffet is available on weekdays. You can enjoy vast range of Korean dishes from Bulgogi, Chap Chae, Bibimbap, Mul Naengmyun, Jeon and loads more with free-flowing soft drinks.
juru Shibuya 8F,12-9, Udagawacho, Shibuya-ku, Tokyo
(The above information is accurate as of June, 2015)