note: under doing some research (specifically the Japanese bgm picks you chose) they are hard to come by or even find. (There is a TON of Japanese RPG bgm music, so obviously its like finding a needle in a haystack. Spent four hours only to find one out of the dozen Japanese bgms you chose for the game). Doing a little investigating myself, but if you are comfortable with replying; what platform did you get most of your music? (trying to gather leads and eliminate other music/video platforms so I don't have to be jumping everywhere from place to place for one song).
And, hopefully with the discovery of the (Japanese BGM) songs, you can add them to the playlist! (or once that is, being developed or put into the fold of the games creation.