That 13 year looks right up my alley-- bring it home, Suntory!
I'm confused. If we're talking about Japanese-owned then that pretty much limits us to Age International and 4R, at the moment. So, the according to their respective websites, the three Blanton's bottlings (Straight from the Barrel, Gold, and Green) and two 4Rs (Platinum and the 80 proof "Fine Old"). The Four Roses website doesn't list the 86 proof export version of the single barrel so perhaps it no longer exists.
If we're talking about bourbons that are available in Japan but not in the US, there are a few more, but that's a different conversation.
Life's too short, and there's too much good whiskey within reach.
Extending to export-only -- not necessarily Japan-only -- you pick up things like the WT13, Early Times Brown Label (the yellow label became 354) and older versions of Evan Williams (12yo and 23yo -- I think the 15yo maroon label is out-of-print like the MM Black Wax). There are also export-only brands like I.W. Harper; I think Yellow Rose of Texas is export-only but in any case HH at various ages and proofs.
Add NDPs and you get the Old St. Nicks and Old Man Winters, but I think the contents compare with various Willetts available in the US.
"Clears up her head with bourbon/Cause beer is so suburban/And declasse for what it's worth"
My wife is Japanese and we travel there as much as we can. Only ever bought Japanese whisky on trips. That'll change next trip.