Rusty maestro Kenichi Arakawa was pretty involved in the music disk scene (usually under his alias THOMAS BROWN), just like co-composer and PMD author Masahiro Kajihara, although a lot less of his work seems to have been dumped and preserved. You know you’re in for a treat when you find one of his disks, though. I adore this man.
Not the first time I have seen the ridiculously popular (in Japan) rock band B’z mentioned on a disk. The new album they were anticipating at the time these comments were written seems to be this, which would put the release of this disk at some time in the first three-quarters of 1991. The most reliable method of dating Japanese text from the 90′s: by what B’z album was coming out soon.