This is a good place to buy local products if you don't mind carrying it to the airport. You will get to receive a large, cute jute bag if you spend above a certain amount of money here. Recommended are the tidbits made from the Hokkaido melons and potatoes.
If you like spicy things, you should try the spicy ramen here. You can ask for more chilli powder if you like. Lots of people have came here to challenge themselves to see how hot and spicy ramen they can take. There is a whole list of great challengers' names displayed all over the shop.