Beef sushi is the unusual specialty of the house here, and you can order by the piece, with options like gunkan-style uni and ikura where the seaweed outer wrapping is replaced by beef. There are also a number of platters with various combinations of cooked, raw and lightly seared beef, served both sushi-style and as beef sashimi.
The extensive menu also includes beef-tongue dishes, inexpensive steaks, spare ribs, deep-fried jumbo chicken wings, and izakaya-style small dishes like pickles and potato salad. One unusual item is kushi-tempura - chunks of beef, beef tongue, avocado or eringi mushrooms that are fried in tempura batter with shiso and ume paste and served on thin skewers.
Drinks options include a few decent craft sake (Y680-780 per ichigo serving) as well as budget wines by the glass, shochu and beer. Sushi averages around Y200 a piece, so you can just pop in for several pieces and a drink if you're in the mood for bar-hopping, or settle in for a full meal if you're so inclined.
Gyumikura is part of the yokocho drinking alleyway on the ground floor of the Aso Building. The building (Aso-Biru in Japanese) is located at the top of the stairs at the southeast exit of Yokohama Station. If you're coming from the east side of the station, take the passageway on the right-hand side of the post office.
This book will introduce you to more than twenty of Japan's favorite specialty foods that are less well known abroad, along with a guide to the best places in Tokyo to try them and expert tips on what to order. From Bento.com.