Not really a walkthrough, more like a playthrough. Includes scenes and boss battles of the game, but excludes all the dungeon crawling. If you're looking for that, I suggest you try looking elsewhere, otherwise, enjoy the videos.
The PSX version. Created by Working Designs (Their last masterpiece).
*Note, videos up to 029 vary in quality, due to me messing around with the video settings. Everything after 030 is recorded with the same settings.