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Action · NEKOUJI

CYAN BRAIN

CYAN BRAIN
Steam Deck Playable 🖥 Windows
Very Positive · 90% of 1,347
DeveloperNEKOUJI
GenreAction
$13.49 −10% near all-time low
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Our take

Great time to buy

Strong reviews, and it's near its cheapest ever.

Quality90/100
Excellent
  • 90% positive of 1,347 reviews
Value100/100
Lowest ever
  • Now $13.49 — 10% off $14.99
  • Lowest we've recorded: $13.49

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steam, Official store, 10% off, $13.49
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DLC(1)

Packs & bundles(4)

About

Cyan Brain is a decadent sci-fi side-scrolling action shooter. Awaken to face endless slaughter and desperate encounters. "Are you ready to make the ultimate devotion?"

‼️This game contains violence, gore, and extreme content. Please read and play with caution.‼️

Unknown time. Unknown place.

The moment the nameless girl opens her eyes, her destiny is already set in motion. With no prayer nor blessing to guide her, she steps alone into a colossal ruin choked with deranged machines.

After unbearable despair and the unending cycle of slaughter, the wavering blue light of her will is shattered, stolen, and trampled again and again, yet she continues forward.

Between cruelty and salvation, the tolling of the Church’s bells cuts through the world, and as their maddening echo strips away the last restraints of flesh and mind, the world begins to shift.

In the depths of this nightmare, she sees it:

Two souls appear, reflections of each other's shadow.
"Are you ready to make the ultimate devotion?"

A dark fable of existence, annihilation, terror and pleasure

- CYAN BRAIN

CYAN BRAIN is a decadent sci-fi side-scrolling action-shooting game.. The game includes the following:

Visceral shooting action

Fear-inducing executions

Mountable heavy weapons

Full-screen animated cinematics

When you take damage in combat, your outfit will gradually tear. Successful attacks trigger random, realistic blood-splatter effects that make the action feel even more visceral. If an enemy defeats you, a unique execution animation will play, and you’ll receive a collectible Death Card upon your character’s demise.

Collectibles:

  • weapons: 16

  • Enemies & Traps: 32

  • Execution & H-Animations: 34

  • Death Cards: 36

  • Full-Screen HCGs: 3

You can view them all in the in-game gallery!

Gameplay Hints:

  • Eating food increases your hydration. Healing items are automatically created at max hydration.

  • Use your melee weapon to take out enemies when out of ammo

  • If you don't want to go out in the nude, saving the game will bring back your clothes.

Protagonist

CV: Momoka Kosuzu

A girl who has lost both her name and her memories. To fulfill the mission entrusted to her, she explores a vast ruined city while battling the many hostile entities created by the organization known as the Church: a group that once reshaped her body into a living weapon. Each fight sharpens her skills, strengthens her body, and leads her to new and powerful gear whose potential she gradually unlocks.

By following the memory fragments scattered throughout the map, she draws closer to the truth behind this devastated world. The companions she meets along the way give every step she takes through the ruins real meaning. In time, those connections will become the signposts guiding her toward the "end of fate" that awaits.

HS202

CV: Ryo Suzuki

A member of the Church's Hunting Squad, but... it seems she's gotten lost.

L

CV: Izumi Mikoshiba

A former researcher of the Convent. Before her death, she preserved her lingering consciousness inside a specialized device and entrusted a certain plan to the newly awakened protagonist.

M

CV: Yui Otokura

A mysterious girl who appeared within a strange domain. She speaks in a cold, mechanical, almost emotionless tone.

*The final version of the game will be uncensored. Store images are for promotional reference only.

Review sentiment over time
positive critical

Media

CYAN BRAIN screenshot 1
CYAN BRAIN screenshot 2
CYAN BRAIN screenshot 3
CYAN BRAIN screenshot 4
CYAN BRAIN screenshot 5
CYAN BRAIN screenshot 6
CYAN BRAIN screenshot 7
CYAN BRAIN screenshot 8
CYAN BRAIN screenshot 9
CYAN BRAIN screenshot 10

System requirements

System requirements platform
Minimum
Minimum:
  • Requires a 64-bit processor and operating system
  • OS: Windows 10+
  • Processor: inter Core i3
  • Memory: 4 GB RAM
  • Graphics: NVIDIA GeForce GTX 650 / AMD Radeon HD 7750(VRAM 1GB以上)
  • DirectX: Version 11
  • Storage: 2 GB available space
Recommended
Recommended:
  • Requires a 64-bit processor and operating system
  • OS: Windows 10+
  • Processor: inter Core i3
  • Memory: 4 GB RAM
  • Graphics: NVIDIA GeForce GTX 650 / AMD Radeon HD 7750(VRAM 1GB以上)
  • DirectX: Version 11
  • Storage: 2 MB available space
Minimum
Minimum:
    Recommended
    Recommended:
      Minimum
      Minimum:
        Recommended
        Recommended:

          Achievements

          10 achievements

          • FIRST_FAILURE
            63.8% of players
          • DEFEAT_THE_FINAL_AUGMENTED_ENTITY
            51.2% of players
          • A_SPECIAL_RELATIONSHIP
            45.3% of players
          • DEFEAT_THE_ENERGY_GUARDIAN
            43.1% of players
          • ARRIVE_AT_THE_SECRET_LOCATION
            42.0% of players
          • DEFEAT_THE_AERIAL_GUARDIAN
            36.4% of players
          • DEFEAT_YOURE_BEST_FRIEND
            31.9% of players
          • DEFEAT_THE_ARTIFICIAL_TWINS
            29.7% of players
          • ARRIVE_ON_THE_LUNAR_SURFACE
            28.7% of players
          • DEFEAT_THE_CHURCHS_TRAP
            28.2% of players

          Age rating & content

          dejus18
          NudezViolênciaTemas sensíveis
          igrsBANNED
          Penampilan TokohKekerasanHoror
          steam_germanyBANNED
          Sexualisierte Gewalt / Sexual violenceDrastische Gewalt

          Price history

          Lowest prices
          Lowest prices view
          All-time low $13.49
          2026-06-19
          Current $13.49
          3-month low $13.49
          12-month low $13.49
          All-time low $13.49
          2026-06-19

          Latest news

          Game info

          Developer NEKOUJI
          Publisher Mango Party
          Platforms Windows
          Compatibility
          Steam Deck Playable
          Genres
          Features
          Single-playerSteam AchievementsSteam CloudFamily Sharing