Rarely is a restaurant so eager to promote its primary mode of dining that it forgoes putting its own name on the front of the store in order to do so. Such is the case, however, with Sushi Club (I had to ask the cashier), a popular restaurant in Ueno’s bustling Ameya-yokocho market area whose no less than four storefront signs proudly proclaim its core culinary M.O.:  ”すし食べ放題 (sushi tabehoudai)”; or, all-you-can-eat sushi.