Operation Darkside DX (聖核戦姫壊滅作戦) is a turn-based strategy RPG built around capturing and raising enemy heroines. You play as a member of the Foundation, the faction locked in conflict with the Holy Core Battlemaidens, fielding low-tier troops (Combatants, TentacleMen, clones) to fight through each chapter, defeat and capture the enemy transforming heroines, and bring them back to base. There you pour Research Points into breaking them down and rebuilding them as your own fighting force, unlocking their exclusive “Holy Core” equipment along the way, all in pursuit of total conquest. This is a complete combat-and-training walkthrough covering system mechanics, the resource/research economy, the story flow and boss fights, the character compendium, the full skill list, equipment and items, and enemy stats
Game Overview
The core loop of Operation Darkside DX is: pick a stage on the world map → turn-based battle → capture the boss → train her back at base → grow stronger → move to the next chapter. Combat is entirely turn-based, and there is no dungeon exploration, the game revolves around squad formation and post-capture training and research. Beyond the base game, there’s also a DLC (a second world map) that adds new stages and a new Battlemaiden
System Mechanics Overview
Turn-Based Combat
Turn order is determined by Speed (SPD). Each character can perform a normal attack, use a skill that costs SP, use an item, or stand by. Some skills are AOE, self-targeting, or gated behind specific conditions (level or Estrus state). Making good use of Buffs/Debuffs (ATK down, DEF down, SPD down, stun, damage-over-time) can swing a fight decisively in your favor
Formation and Standby Recovery
You can arrange your squad’s battle formation. Certain gear lets a character recover HP/SP while on standby (such as the Fluffy Cushion), rotating characters through standby is an effective way to sustain your team in long fights
Leveling Up
Characters can spend resources to level up, raising their stats. Leveling costs increase with each level (see the character compendium below for each character’s base cost and per-level increase). Growth rates (HP/ATK/DEF/SPD gained per level) vary by character, and high-growth characters pull noticeably ahead in the late game
Efficient Farming
When grinding for money, Research Points, or experience, Nayuta Yagumo is recommended as your main damage dealer: activate Thunder God’s Form (ATK +70%, can be toggled anytime at no cost to your turn), then unload with Fatal Slash (the lower her HP, the higher the damage, and the damage dealt heals her back) for maximum output efficiency. Clear Mind (ATK +150%) stacks, so against high-HP targets you can spend a few turns stacking it before unleashing everything at once. Always confirm Thunder God’s Form is active before attacking, it will typically one-shot trash mobs. Just remember Thunder God’s Form drains 30 HP per turn on its own; keep sustain up through Fatal Slash’s lifesteal or ally healing
Economy and Research Points
The game has two resources:
| Resource | Use |
|---|---|
| Money | Spent at the Black Market on consumable items and rare equipment (see the equipment/items chapter for prices); leveling up Battlemaidens also costs money. |
| Research Points | Invested in the training/research panel at your base to advance the research progress of captured Battlemaidens. |
Training Panel: Choosing a Training Method (Post-Capture)
| Training Method | Result |
|---|---|
| Lewd Training | Advances “Lewdification” progress, unlocking Estrus-related combat states/passives. |
| Education Training (brainwashing) | Advances brainwashing/education progress, changing the character’s Mood so she becomes obedient and willing to fight for you. |
| Holy Core Research | Researches her Holy Core, unlocking that character’s exclusive Holy Core equipment (a powerful passive, see the equipment chapter). |
It’s recommended to push Education Training to the threshold needed for a character to join your active roster first, then invest in Holy Core Research to unlock her Holy Core equipment as needed. Mood shifts along the Education Training progress track, moving from “Rebel/Contempt/Despair” states toward “Submissive/Loyal/Deprave” states. Note that the DLC character Diamond only becomes available after “Education Training” is complete
Story
The Foundation, an evil organization long at war with the Holy Core Battlemaidens, now in decline, is the side you play as. As “Doctor,” you command Combatants, clones engineered from Rikka Minase’s genetic material, and TentacleMen, defeating and capturing the Holy Core Battlemaidens one by one, then bringing them back to base to break them down with Research Points and turn them, one after another, into your own fighting force
The story opens with rookie Battlemaiden Akiho Sasaya: the Foundation sets a cruel trap, luring the isolated Akiho into a sealed room and taking her captive. Her partner, Rikka Minase, rushes to save her, only to be seduced and captured by an already-fallen Akiho. The incident draws the attention of the Holy Core Corps; the vice-commander, Elena Seidou, heiress of the Seidou Group, steps in personally, but she too is brought down, blackmailed and drugged into defeat by the Foundation. Next, the genius hacker Battlemaiden Kei Nekomiya makes her move, deliberately allowing herself to be captured with a tracking device hidden inside her, using herself as bait to lure in the strongest Battlemaiden and commander-in-chief, Nayuta Yagumo, straight into the heart of the Foundation’s base. Nayuta briefly seizes control of the battle, but in the final showdown she runs into Elena, already “educated” into corruption by the Foundation and now turned against her, and, weakened by the backlash of her own Thunder God’s Form, is ultimately overpowered and captured
Having lost its two pillars, the Holy Core Corps collapses. A month later, Akiho, Kei, Nayuta, and Elena, now all Foundation enforcers, sweep the world, hunting down and capturing the remaining rank-and-file Battlemaidens. Once every last Holy Core Battlemaiden has been captured and stripped of her fighting strength, “Operation Darkside” is declared complete, and the Foundation claims total victory. (The full appearances and captures of Diamond, Hisui, and other characters are covered in the DLC content)
Story Progression & Boss Guide
Capture order (by starting level): Akiho Lv8 → Rikka Lv10 → Elena Lv12 → Kei Lv13 → Nayuta Lv15. Each chapter’s final boss is that chapter’s target Battlemaiden
Prologue / Tutorial
Goal: Get familiar with turn-based combat, formation (front/back row), SP and skills, and how to use the training/research panel. Fight with basic Foundation troops and follow the prompts, there’s no need to worry about losing here
Chapter 1: Akiho Sasaya
Goal: The Foundation targets its first Holy Core Battlemaiden, “Akiho Sasaya.” Push through the stage, clearing trash mobs (Patrol Drones/Patrol Androids), then face and capture Akiho at the chapter’s end. Her attack is low and her defense is thin, so basic attacks and focus fire will take her down quickly. Once captured, she becomes your healer, providing group healing via her Milk Supply skill
Chapter 2: Rikka Minase
Goal: Turn your attention to the high-speed physical fighter “Rikka Minase.” She’s fast and can act multiple times per turn, so watch out for her going first. Prioritize slowing her down or focus-firing her, and lean on Akiho’s healing to keep your team standing. Once captured, Rikka becomes a fast, multi-hit physical attacker (Combo Attack / Straight Punch / Overdrive)
Chapter 3: Elena Seidou
Goal: “Elena Seidou” is an extremely tanky defensive type (600 HP). A straight slugfest takes a while, so bring DEF-down and damage-over-time effects to wear her down gradually. Once captured, she becomes your key shield unit, her Immortal Protection lets the whole team negate one instance of damage, which is essential for the fight against Nayuta later on
Chapter 4: Kei Nekomiya
Goal: “Kei Nekomiya” is a high-ATK, high-SP mechanical hacker type (ATK 120, SP 200). She can hack and control mechanical enemies, and her own damage output is high too. It’s best to slow her down first or use Elena’s shield to absorb her burst. Once captured, Kei can use Hacking to control mechanical enemies and Self-Destruct Command to make puppets blow themselves up, making her extremely strong against mechanical-enemy stages
Chapter 5: Nayuta Yagumo (Final Showdown)
Goal: The final battle against the strongest Battlemaiden and commander-in-chief, “Nayuta Yagumo.” Her attack power reaches a staggering 99999, effectively a one-hit kill, so tanking it is not an option; you have to work around it mechanically. Core strategy: the moment the fight starts, use Elena’s Immortal Protection (negates one hit of damage for the whole team) or Immovable Aura/Energy Shield to cancel out her attack that turn, then go all-in during her recovery/cooldown windows, chipping away at her 1200 HP turn by turn until she’s down. Defeating her captures Nayuta, and the main story heads into its final stretch
Final Chapter: Operation Darkside
Goal: The main story’s finale. Using your squad of trained, fallen Battlemaidens, you fight through a rotating gauntlet of generic Holy Core Battlemaidens at various levels across the world. This chapter has no designated boss, every opponent is a generic Battlemaiden of some level. Stock up on healing and you’ll close it out without much trouble. Once every last one is defeated, the system declares the Holy Core Battlemaidens fully wiped out, triggering the complete-conquest ending. (Diamond, Hisui, and other characters’ full appearances and captures are part of the DLC content)
DLC (Second World Map)
The DLC adds 8 stages, with a story centered on hunting down escapees, introducing two new Battlemaidens: Diamond and Hisui Saionji. In the DLC, Kei becomes a playable unit (some stages limit which characters/how many can be deployed). The DLC lets you additionally capture Diamond, and it’s also where Hisui makes her full appearance
| DLC Stage | Content |
|---|---|
| DLC-1 Prologue / DLC-2 The Final Operation | Two targets have escaped (Hisui and a low-ranking Combatant). The Foundation can only spare 2 people for the search. |
| DLC-3 Infiltration Success / DLC-4 An Old Acquaintance | Infiltrate and make contact with an old acquaintance to track down the escapees. |
| DLC-5 Diamond | Introduces the pet-type Battlemaiden “Diamond,” Lv30, HP650, ATK325, high Speed (30). Both her attack and speed are high, so it’s best to lock her down (stun/slow) before finishing her off quickly. |
| DLC-6 Secret Weapon / DLC-7 Kei’s Plan | Kei’s operation plan moves forward (Kei is playable during the DLC). |
| DLC-8 Rebellion | The final target, “Hisui Saionji,” Lv40. She has two forms: her normal form (HP700) and her giant/berserk form (HP8500, ATK150). A long fight, stock up on healing and shields and take it steady. |
Character Compendium and Training
Stat format: base value (growth per level). Skill names follow the in-game English localization. There are 7 playable heroines in total (including 2 DLC characters)
Akiho Sasaya
| Milk Supply | SP27／Lv8 | Restores 20~30 HP to one ally |
| Extra-Rich Milk | SP30／CD3／Lv12 | Removes all debuffs except incapacitation |
| Milk Supply Overdrive | SP60 | Fully restores the whole team; disables the previous two skills after use |
| Mood | Disgust(0)→Expecting(2)→Submissive(3) | |
| Overdrive | SP40／CD4／Lv5 | Acts 3 times in a row; unable to act for the next 3 turns |
| Combo Attack | SP25／Lv11 | Randomly attacks enemies x3 |
| Straight Punch | SP35 | Attacks a single enemy without consuming a turn |
| Mood | Rebel(0)→Resist(1)→Despair(2)→Loyal(3) | |
| Intent to Counterattack | SP25／CD2／Lv8 | Reflects damage when attacked (based on her own DEF) |
| Immovable Aura | SP25／CD2／Lv14 | DEF +99 for 2 turns |
| Immortal Protection | SP60／CD3 | The whole team negates one instance of damage |
| Mood | Disgust(0)→Despair(2)→Deprave(3) | |
| Hacking | SP40／CD1／Lv13 | Controls a mechanical enemy as a puppet, taking hits meant for Kei |
| Self-Destruct Command | Lv13 | Makes the puppet self-destruct; damage = its remaining HP |
| Refactoring | SP20／Lv15 | Raises a mechanical target’s ATK and DEF |
| System Restore | SP15 | Optimizes a mechanical unit, restoring HP and granting an immediate action |
| Mood | Submissive(0)→Pleasure(3) | |
| Thunder God’s Form | On／Off | ATK +70%, takes 30 damage per turn, can be toggled anytime |
| Clear Mind | SP25／Lv1 | Charges up ATK +150%, stacks |
| Fatal Slash | SP50／CD3 | Massive single-target damage, higher the lower her HP, heals HP from damage dealt |
| Mood | Contempt(0)→Angry(2)→Deprave(3) | |
| Thought Stop | CD3 | Raises attack power for a period of time |
| In Heat | CD3 | Puts the user into Estrus for 3 turns |
| Mood | Resist(0)→Expecting(2)→Loyal(3) | |
※Hisui also has a boss version (Lv40, two forms), with different stats from this training version, see the “Boss Stats” table below. Don’t mix the two up
Diamond (DLC · Unlocks After Education Training Is Complete)
| Sit | — | “Seriously the most useless skill ever!!!!” |
| Bite | CD10 | Target unable to act for 1 turn |
| Mood | Contempt(0)→Despair(2)→Deprave(3) | |
※Diamond only becomes available as a playable character after “Education Training” is complete
Full Skill List (41 Total)
SP = cost／CD = cooldown／Lv = level requirement (blank means no requirement or not specified)
| Skill | SP | CD | Lv | Effect |
|---|---|---|---|---|
| Bite | 0 | 10 | Bites a single enemy target, leaving it unable to act for 1 turn. | |
| Boost | 10 | 0 | Increases attack power by 15%. | |
| Aphrodisiac Gas | 0 | 0 | 10 | Temporarily reduces an enemy’s ATK and SPD by 25%; if the target is female, ATK and DEF are both reduced. |
| Clear Mind | 25 | 0 | 1 | Charges the next attack, increasing ATK by 150%; stacks with repeated use. |
| Emergency Heal | 0 | 1 | 1 | Restores the user’s own HP; the lower the HP, the more it restores. |
| Diagonal Slash | 0 | 4 | Diamond’s skill. Stuns a single enemy for 2 turns. | |
| Divine Caliber | 25 | 3 | Deals damage to an enemy and drastically lowers their defense. | |
| Energy Shield | 20 | 3 | Negates the next instance of damage taken. | |
| Fire Support | 30 | 1 | Summons robots, up to 2 at once. | |
| System Restore | 15 | 0 | Optimizes code and restores HP, allowing an immediate action (only effective on mechanical enemies). | |
| Straight Punch | 35 | 0 | 15 | Attacks an enemy without consuming a turn. |
| Healing | 0 | 0 | Restores HP and SP; HP continues to recover over time. | |
| Immovable Aura | 25 | 2 | 14 | Increases DEF by 99 for 2 turns. |
| Immortal Protection | 60 | 3 | All allies negate one instance of damage. | |
| Hacking | 40 | 1 | 13 | Controls an enemy as a puppet; attacks aimed at Kei are taken by the puppet instead (only effective on mechanical enemies); success rate depends on level difference and remaining HP. |
| Energy Laser | 30 | 0 | Deals 30 damage to an enemy. | |
| In Heat | 0 | 3 | Anyone who has completed training under a low-rank Combatant can enter Estrus at will; the user enters Estrus for 3 turns. | |
| Milk Supply | 27 | 0 | 8 | Restores 20~30 HP to a single ally. |
| Extra-Rich Milk | 30 | 3 | 12 | Removes all debuffs except incapacitation. |
| Milk Supply Overdrive | 60 | 0 | Fully restores every ally except Akiho; disables Milk Supply and this skill for the rest of the battle after use. | |
| Fatal Slash | 0 | 0 | Deals massive damage to an enemy (the lower the user’s HP, the higher the damage) and heals the user’s HP based on damage dealt. | |
| Overdrive | 40 | 4 | 5 | Acts three times in a row, but becomes unable to act for 3 turns after use. |
| Thunder God’s Form (On) | 0 | 0 | Increases ATK by 70%, takes 30 damage per turn; can be toggled on or off anytime at no cost to the turn. | |
| Powerful Punch | 0 | 4 | 5 | Deals 2.5x normal attack damage to a single enemy; the user is unable to act for 1 turn. |
| Combo Attack | 25 | 0 | 11 | Randomly attacks enemies x3. |
| Repair | 15 | 0 | Heals an ally for 15% HP. | |
| Intent to Counterattack | 25 | 2 | 8 | Reflects damage when attacked within a set duration (based on the user’s own DEF). |
| Refactoring | 20 | 0 | 15 | Rewrites code, raising ATK and DEF (only effective on mechanical targets). |
| Self-Mod | 10 | 0 | Grants a random buff. | |
| Self-Repair | 10 | 1 | Restores 35% HP. | |
| Sit | 0 | 0 | Diamond’s skill (seriously the most useless skill ever!!!!). | |
| Thought Stop | 0 | 3 | Focuses the mind, raising attack power for a period of time. | |
| Trap Shield | 20 | 4 | The next enemy to attack Elena is temporarily left unable to act. | |
| Shockwave Pulsar | 35 | 2 | Paralyzes an enemy for one turn, leaving it unable to act. | |
| Absorbing Tentacles | 0 | 2 | 1 | Absorbs half of an enemy’s SP; if the target is female, HP is absorbed as well. |
| Self-Destruct Attack | 0 | 0 | Performs a self-destruct attack; damage dealt equals the user’s remaining HP. | |
| Self-Destruct Command | 0 | 0 | 13 | Orders a puppet to self-destruct; damage dealt equals that puppet’s remaining HP. |
| Mutual Collapse | 0 | 2 | 10 | Both the user and a target enemy are unable to act for 1 turn. |
| Tentacle Service | 0 | 0 | 5 | Transfers all of the user’s SP to a single ally (only effective on female targets). |
Equipment Compendium
Holy Core Equipment (Unlocked via Holy Core Research)
Unlocked after completing each character’s “Holy Core Research” on the training panel, powerful passives tailor-made for that character, 7 in total
Standard / Rare Equipment
Items
| Item | Effect | Description | Source |
|---|---|---|---|
| Stick Grenade | HP-50 | Thrown at an enemy to deal damage. | Black Market, 100 Gold |
| Croissant | SP+50 | A convenient light snack for an elegant taste experience. | Story／Reward |
| First Aid Kit | HP+10~100 | Its effect is a little inconsistent, but it’s better than nothing in an emergency. | Black Market, 100 Gold |
| Bread | HP+40 | Food that’s always within reach, quietly supporting busy people everywhere. | Story／Reward |
Boss Stats
| Lv | Boss | Appears | HP | ATK | DEF | SPD |
|---|---|---|---|---|---|---|
| 10 | Akiho Sasaya | Chapter 1 | 140 | 15 | 3 | 9 |
| 14 | Rikka Minase | Chapter 2 | 250 | 35 | 6 | 14 |
| 18 | Elena Seidou | Chapter 3 | 600 | 65 | 12 | 8 |
| 20 | Kei Nekomiya | Chapter 4／DLC | 400 | 120 | 10 | 17 |
| 24 | Kei Nekomiya | Chapter 4／DLC | 700 | 100 | 13 | 17 |
| 26 | Nayuta Yagumo | Chapter 5 (Final Showdown) | 1200 | 99999 (one-hit kill tier) | 0 | 10 |
| 30 | Diamond | DLC-5 | 650 | 325 | 30 | 30 |
| 30 | Kei Nekomiya | Chapter 4／DLC | 1100 | 120 | 20 | 17 |
| 40 | Hisui Saionji (Normal Form) | DLC-8 | 700 | 120 | 20 | 0 |
| 40 | Hisui Saionji (Giant Form) | DLC-8 | 8500 | 150 | 0 | 0 |
Status / Buff Reference
| Status | Description |
|---|---|
| Stunned | Unable to act (stunned); skips its turn for a set number of turns. |
| Hurt | Takes damage-over-time each turn. |
| Heal | Recovers HP each turn. |
| DEF UP | Defense increases. |
| DEF DOWN | Defense decreases. |
| ATK UP | Attack power increases. |
| ATK DOWN | Attack power decreases. |
| SPD UP | Speed increases (acts sooner). |
| SPD DOWN | Speed decreases (acts later). |
| Continuous Action | Can act again in succession. |
| Return Damage | Reflects damage when hit. |
| Disarm | Weakens the target’s action effectiveness. |
| Estrus | The state entered after activating certain Estrus skills. |
Event Scene Preview
Operation Darkside DX features a rich lineup of training and story event scenes. Below is a sample image in a bodysuit-form setting to start; the higher-exposure adult CGs are collected in the age-gated section further down
This media contains 18+ content
Please confirm that you are at least 18 years old before viewing this media.
Overall Review / Impressions
A tight, well-crafted turn-based training RPG: the combat system is straightforward, the training loop is memorable, and the value for money is solid, even if the overall depth is fairly standard. For fast farming, lock in on Nayuta Yagumo’s Thunder God’s Form + Fatal Slash burst combo; for the Nayuta showdown itself, use Elena’s shield mechanics to neutralize her one-hit-kill attack
Game Info
| Game Name | Operation Darkside DX (聖核戦姫壊滅作戦) |
| Publisher | Mango Party |
| Developer | ダークネスLAB |
| Supported Languages | Traditional Chinese, Simplified Chinese, Japanese, Korean, English |
| Recommendation | ★★★★☆ |
| Gameplay | ★★★☆☆ |
| Value for Money | ★★★★☆ |
| SONY’s Playtime | About 2.5 hours |
Operation Darkside DX Buy Portal
Steam: Buy Operation Darkside DX (Complete Edition with DLC, Uncensored)
DLsite (base game): Buy Operation Darkside on DLsite
DLsite (DLC): Buy DLC: Complete Combatant Corruption Chapter
Your purchase is the strongest support you can give to the creators and to us
Gentlemen, together, we go strong!
👉 You may also like: Operation Darkside DX news (Steam launch info)
