Operation Darkside DX is an updated version that combines the main game and DLC content. Compared to the original version, this edition includes the following updates and adjustments: Includes the full content of the main game and the DLC Operation Darkside DX: Complete Combatant Corruption Chapter. Fully updated character sprites and CG scenes for Kei Nekomiya. Updated casual outfits for the five characters from the original version. Improved audio quality for selected voice lines. Changed the voice actress for the DLC character Diamond to Ryoko Tezuka. Long ago, the Forren Foundation was at the brink of conquering the world when the sudden appearance of the Holy Core Battlemaidens, warriors who can transform at will, pushed the Foundation to defeat.