Hiro's Game Music Album － ONI 2,3,4 －

[Secret Squirrel]

I can't find any hard evidence that HGMA-003 is the cat number.

[CHz]

HGMA-003 appears to be the catalog number for a (self-published?) CD-R version of this album: http://www.suruga-ya.jp/database/186110229001.html. As far as I know, none of EGG MUSIC's digital releases have catalog numbers.

Here's HGMA-004~5: http://vgmdb.net/album/11049.