Planned Release Date: December 2025

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, Death, Amputation, Self-harm, Piercing, Interspecies Sex, Futanari.

About This Game

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

Unknown time, unknown place…

The moment this unnamed entity awakens, her destiny is already etched into the very marrow of her bones. Not knowing how to pray, she simply confronts a shattered world of machines.

At the end of endless slaughter and a fated encounter with despair…

The flickering blue light is repeatedly broken and stolen, yet she does not stop her advance.

When the church bells echo between violence and salvation, and the limits of flesh, blood, and mind crumble, the world quietly begins to transform. 

In the deepest reaches of the nightmare…

Two souls, reflecting each other's shadows, finally appear. "...Are you prepared to offer up your everything?"

A dark fable of existence and annihilation, of terror and pleasure

- CYAN BRAIN

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

Impactful and satisfying shooting mechanics

Execution animations that force you to face your fears

Powerful, rideable weapons

detailed, full-screen H animations

When taking damage in combat, your outfit will progressively break. When attacks land, realistic, random blood splatters will erupt, making the action more vivid and violent. When defeated by an enemy, a corresponding execution animation will play, and you will receive a collectible death card after your character dies.

Collectibles:

• weapons: 16

• Enemies & Traps: 32

• Execution & H-Animations: 34

• Death Cards: 36

• Full-Screen HCGs: 3

A Gallery is available to review all your collections!

Protagonist

CV: Momoka Kosuzu

Has lost her memory. She fights various hostile entities and monsters in a huge, ruined city. Through her brutal battles, she enhances her own abilities, finds new and powerful weapons, and unlocks their potential. Using "fragments of memory" scattered throughout the world as clues, she gets closer to the truth of this desolate world. The bonds she forms with the companions she meets on her journey give her steps a firm sense of purpose, and together, they will move toward the "end of fate" that awaits them.

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 nun, she entrusted a remnant of a plan to the protagonist.

M

CV: Yui Otokura

A mysterious woman who appeared in a strange domain.

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