Nihon-shu. It's more like wine than like whiskey.
Approx 30-36 proof range.
Nihonshuu has 15%-20%. The one with 25%-45% is Shouchuu.
Not a huge fan of shochu personally. Too bitter. It becomes better with some soda, but then I'd better have a highball. And back to whisk(e)y we are!
I'm not a particular Shouchuu fan either and only drink them in Japan, but a bitter one I never had. However, I heard that there are a lot of bad ones out there.
Recently a Japanese friend who is into Shouchu giftet me this one:

Kichishiroku Pot 25°, 24.3 fl oz
https://www.amazon.co.jp/-/en/Kichishiroku-Pot-25%C2%B0-24-3-720/dp/B002B3R9B2?th=1Really recommendable. Price-perfomance ratio is superb.