I added the missing credits which only appears on the back cover (without the obi) and added lots of new scans / photos.
But I'm missing the assistant mixer, I can't read the last kanji well: 正木?
The only decent image I can find of the full back cover is this one:
https://vgmdb.net/db/covers.php?do=view&cover=605643
Unfortunately Discogs, which made a nice page for this album, forgot this credit. And I can't find any information on a mixer from this era with these first 2 kanji.
So can anyone find the assistant mixer please?