旅のはじまりビール or Beer to Start the Journey
Real beer made with barley from Tokachi (Hokkaido, single malt), hops and water.
I've only seen them in Hokkaido and is even rare there.
The popular type of beer in Japan is lager with a few brands specializing in ale.
A lot of beers sold at supermarkets have additives like corn starch so if you want beer made from just barley, hops and water, then you have several options.
Kirin Ichiban Shibori
Sapporo Ebisu
Suntory Premium Malts
being a few examples.