Nikka Blender's Bar is located at the basement of the building where Nikka Whiskey headquarter is located. I do think there is some business arrangement with Nikka Whiskey, although I am not sure.

Nikka Blender's Bar is actually owned and operated by a company called Kid Spirits which is located at Shinjuku. Kid Spirits operates restaurants around Tokyo, but company Kids Spirits is not owned by Nikka Whiskey nor parent company of Nikka Whiskey, Asahi Beer. Company Kids Spirits' parent company is KIDS HOLDINGS.

Company Kid Spirits may have business relation with Nikka Whiskey to operate a bar specializing in Nikka whiskey on the basement of Nikka Whiskey's company headquarter building, but Nikka Blender's Bar is not owned and operated by Nikka Whiskey.