Play as the Forren Foundation’s chief scientist to capture, study, and convert the Holy Core Battlemaidens into your loyal followers!

Mature Content Description
The developers describe the content like this:

All characters depicted are over the age of 20.
Content Warning! This game depicts: Violence, Sex Acts, Non-Consensual Sex, Sexual Assault, Gang Rape, Inflation/Belly Protrusion, Piercing, Interspecies Sex, Bondage, Tentacles, Exhibitionism, Anal Sex, Paizuri, Oral Sex, Use of Sex Toys, BDSM.

About This Game


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.

【The righteous battlemaidens will fall one by one...】
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.

As the organization's chief researcher, your mission is to capture the Battlemaidens, study their abilities, and turn them into assets for the Foundation.

Capture them all, build your army, and take the world.





【Turn based battles & research systems】
Defeat the Battlemaidens in turn-based combat to capture them.

Once captured, each heroine can undergo various forms of research.

A fully researched Battlemaiden can be deployed into your combat units with new skill builds.

Equip your troops, strengthen your squads, and forge your own corrupted legion!



【7 Holy Core Battlemaidens with full voice acting】
Each heroine features dedicated artwork, voice lines, story content, and training scenes.

• Akiho Sasaya — A cheerful and optimistic rookie with strong ideals

• Rikka Minase — The cool-headed, close combat specialist

• Elena Seidou — Deputy commander of the Corps, elite background, overwhelming strength

• Kei Nekomiya — Intelligent and mysterious. Also, hard to read.

• Nayuta Yagumo — The calm and commanding leader of the Battlemaidens.

• Hisui Saionji — Former secretary of the Battlemaidens who infiltrates the Foundation to rescue the deputy commander.

• Anastasia Petro Diamond — A sword-wielding soldier with exceptional discipline

【35+ H-Scenes】
Every Battlemaiden features extensive training events and CGs: Milking, Creampies. Group play, Livestreams... Multiple positions in a variety of situations, catering to all sorts of fetishes!

• A newly awakened rookie forced into a milking session after capture



• The proud deputy commander serving her superior under the office desk



• A justice-driven fighter girl dressed as a bunny hostess to entertain guests



• Watch as former teammates are turned into playthings



【Basic information】
• Heroines: 7

• H scenes: Over 35 H-CG sets with more than 400 variations

• Voice: Full voice acting for all heroines

• Estimated playtime: 2 to 4 hours

• Due to version adjustments, some voice performances may differ from the displayed text.