Asahi Black Beer, born in 1982, is a dark beer that traces its roots to the Munich-style dark beers that began to be popular in Germany in the late 19th century. It features a rich malt aroma and a smooth taste with a slight sweetness. This beloved flavor, long enjoyed at home and in beer halls, has been revived with a fresh new look.

From Asahi Kuro Nama Munich-Type -Asahi official site-

I didn't know Asahi Beer made a dark beer. It has a bitterness that's kind of addictive, yet it’s also easy to drink. I really like this one.