The cast of a small Japanese production of 'Hair', eventually became the Tokyo Kid Brothers. This was in the late 60s.

I stumbled upon the CD purely by chance: https://www.discogs.com/Various-Hair-The-Original-Japanese-Cast-Recording/release/14621241

Catalog number: BVCK-38043
Genre: Psychedelic Rock

I found 2 names that are on the CD that were also in TKB, so it's got to be the same version. I'm excited to listen, it's definitely historic.