Due to CERO ratings (Japan's ESRB), the Japanese version actually retains more blood splatter effects during Beast Drives. The US version diluted the red effect to a brown dust. The ISO preserves the crimson carnage.
For players using modified hardware or Japanese region-locked consoles, having the native NTSC-J ISO is the only way to play without regional bypass software. Key Gameplay Mechanics
Alongside these, four new characters joined the fray, including Reiji the Crow, Ryoho and Mana, and the mysterious Nagi the Spurious (who fights with a halberd made of bone).