Some infos/correction:
1) The CD release should be the parent since it has the same date release of the Vinyl release.
2) About the price release looking
here, it's 2812 yen. But I have discovered on the first HNK album (D30G-0038) there are two obi in existence with different prices; the copy I have of that album has a different price from
this, but they have the same code bar.
Maybe also there are two version of this cd with a different price.
3) Most japanese sites report "水谷公生" like arranger of tracks 9 & 10. It stands for "Mizutani Kimio", but other western sites report "Mizutani Kousei" as different translation. Honestly don't know which is the correct one.
4) Also about tracks 9 & 10, composition is credited to "大安蓮". It's an alias or an early name of the same performer "Masato Shimon", but some western site report/translate it like "Taian Ren".
Unfortunately old HNK albums don't report infos on their booklet, maybe the "Best compilation album" of 2002 has those and more accurate infos but I haven't scans of the booklet inside.