Popular online retailer Rakuten has a Café in Shibuya. Besides serving food and drinks that are popular on the site's main retailing webpage "Rakuten Ichiba", the staff can give you information about anything on Rakuten from financial to product advice. Free e-readers are available as well as free 1GBPS wifi, in case you want to make a Rakuten purchase.
Ma Maison Shibuya-Koen-Dori Building, 1-20-6 Jinnan, Shibuya Ward.
11 a.m. - 11 p.m. (7 days a week)