The Luxury Lounge in NYC announcement to the Japanese market first brings up the culture of elite lounges as a “thing” in Japan. For example the AEON Mall in Okinawa had a lounge for card holders to relax while shopping. Thanks to user jamar030303 on reddit for the gouge regarding another Japanese Lounge open to AmEx Card holders in Kyoto. I am not sure if the American Gajin card holder would be allowed in, but this guy got in, no mention of which country issued the card.
[the lounge is in] Kyoto, Japan. It’s in the middle of a temple, and apparently showing your AmEx card at the temple entrance discounts the admission some, too.
Here is the AmEx page. Here’s some pictures. One cardholder is allowed to bring three guests, here you can see which cards allow you entry. The cheapest US-issued card that will let you in is the Delta Gold, and aside from that, Gold, Business Gold, Plat, Business Plat, and Centurion cardholders are allowed access.
Hope those serving in Japan can take advantage!