The clean, unpatched ISO should have an MD5 checksum specific to the Japanese release (approximately 2.3GB in size).
Since the original game is region-locked to Japan, there are three primary ways to play it in English today: 1. Emulation (PCSX2 on PC or AetherSX2 on Android) berserk ps2 iso english
It follows Guts’ quest to restore Casca's sanity by traveling to Elfheim. The game also features a unique original subplot involving a new Apostle named The clean, unpatched ISO should have an MD5