Myrdin Potter
Hero
And, by the way, just for general information (ie, I'm not directing this personally at you, Panda-s1), 5e was released in Japan about 2 years ago (PH at the end of 2017) and the other books are being translated and released (Baldur's Gate:Avernus was just released so they are close to catching up). I've never lived in a big city here and have never directly met a Japanese person who plays but somebody is buying the books.
Have they caught up with all the adventure books now? Last time I was in a game store there looking just the core 3 were out. The guy behind the counter told me that they are a steady seller but that Sword World sells a lot more books. The older Japanese gamers I talked to all said they started with AD&D (a ton of that material was translated I think) but slowly others gained popularity locally with Sword World being one. I find it amusing that Sword World does not have Japanese character classes even though the art is obviously Japanese.