Screenshots
Watch trailer on Steam ↗CYAN BRAIN
NEKOUJI · Published by Mango Party, Mango Party News
Content notice: All characters depicted are over the age of 20. Content Warning! This game depicts: Violence, Sex Acts, Death, Amputation, Self-harm, Piercing, Interspecies Sex, Futanari.
Very Positive — 90% positive (1,526 reviews) · 10 achievements
Last updated 28 Sept 2026
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?"
£11.51
£12.79Lowest price we've ever recorded
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Price history
Action · 2025 · More £5 - £15 games
In CYAN BRAIN, prepare for a decadent sci-fi adventure where every level is an endless battlefield. NEKOUJI invites you to confront relentless enemies and make ultimate devotion your creed.
About this game
‼️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.
System Requirements
Will my PC run this? →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
- 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
Supported Languages
*languages with full audio support
Latest news
AnnouncementsOfficial
What's Coming to Cyan Brain 2
{STEAM_CLAN_IMAGE}/45828817/ea2909a7ad2254d626251cfcd695a2f04fd42afb.jpg Hi everyone! Even after nearly three months, we continue to receive wonderful feedback and impressions from all of you regarding Cyan Brain. Thank you so much—your support is what keeps us moving forward! To show our appreciation, we’d like to share a sneak peek at some of the content and visuals from our upcoming project. ■ Ragdoll Physics: First, we are implementing a ragdoll physics system for our monsters. Along with this, we plan to introduce a "Gravity-Manipulating Weapon" that allows players to freely manipulate and toss around enemy corpses. ■ Story: Animation production for all NPCs in the first stage is now complete. The story of this sequel centers around the Special Operations Squad to which the protagonist belongs. ■ Combat System: We are currently focused on developing a brand-new combat system. Compared to the prequel, we are striving to provide players with more intuitive controls and a more exhilarating sense of impact. Thank you for your continued support, and please look forward to Cyan Brain 2! - NEKOUJI STUDIO {STEAM_CLAN_IMAGE}/45828817/3917ec14e62b38e80682e8b420c793c3bb0879c5.png {STEAM_CLAN_IMAGE}/45828817/edc8b33d5e4b7a85ad3fd2863c39bdc1b9eb40fa.png {STEAM_CLAN_IMAGE}/45828817/decb12bd383940484f09df1986d4ed14da34154d.png {STEAM_CLAN_IMAGE}/45828817/f344b05b44a427a7fb4975c45c85aace24f614e3.png {STEAM_CLAN_IMAGE}/45828817/eaa3e7a02a410d7ca049204f0f06ab2c1ce0688b.png {STEAM_CLAN_IMAGE}/45828817/9618caa38ea1cfd3d20a0b871a1e972a5aa14acf.png {STEAM_CLAN_IMAGE}/45828817/75bb984c6cf0d7dfd0973504163f84d0ece5ca6c.gifRead full article on Community Announcements (Chet)AnnouncementsOfficial
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V1.15 Update
Fixed shower animation errors.Fixed some text issues.Read full article on Community Announcements (Chet)AnnouncementsOfficial
"Mirai's Midnight Training" Store Page Open! A "foxy" healing time for two~
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