Synopsis
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.
A decadent sci-fi side-scrolling action-shooting game.
Note: This game contains violent, grotesque, and extreme content. Some expressions may allude to physical damage, psychological violation, and sexual domination. Viewer and player discretion is advised.
H-System Features
When defeated by a monster, a corresponding execution animation will play.
* The total animation time is approximately 25 minutes.
You can unlock full-screen H-animations.
After an execution animation plays, you can obtain a death card.
During combat, your outfit will be progressively damaged as you take hits!
Characters (In-game Dialogue is Fully Voiced)
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.
A Deadly Struggle with Murderous Machines, Modified Humans, and Mutated Animals
29 different types of enemies and traps will appear!
When you’re defeated, a unique 2D animation will play for each enemy, offering a distinctive and stylistic experience.
The entire game features high-quality, realistic sound effects to enhance your immersion.
A Variety of Powerful, Hardcore Weapons
The destructive effects on enemies change depending on the performance of each firearm.
The game includes a recoil system, with different weapons having varying power and knockback effects on enemies.
Each type of enemy has its own unique defeat animation.
When attacks land, realistic, random blood splatters will erupt.
Deploy Powerful, Rideable Weapons onto the Battlefield!
High-Quality 3D Stages
The 2D and 3D backgrounds are combined to realistically depict beautiful light and reflections. The transitions and movements between scenes are expressed with a sense of realism and presence.
(Text: English / Voice: Japanese)
| Circle | NEKOUJI |
| Tags | R18, Action, Voice, Music, Animation, Application, Contains Grotesqueness, Chinese Simplified, Chinese Traditional, Korean |
| Price | 3,080JPY |
Editorial Review
CYANBRAIN positions itself at the intersection of hardcore action gameplay and surrealist narrative—a rare hybrid in the adult game space that prioritizes visceral combat and atmospheric storytelling over conventional sexual pacing. The “decadent sci-fi side-scrolling action-shooter” framing distinguishes it immediately from the VN-heavy landscape of DLsite, anchoring the R18 content within a mechanical framework that demands skill and engagement rather than passive consumption.
The work’s distinctive appeal lies in its commitment to grotesqueness and psychological extremity as thematic cornerstones rather than supplementary flourishes. The synopsis deliberately obscures plot clarity—an unnamed protagonist, intentionally fragmented worldbuilding, and cryptic dialogue about “offering everything”—suggesting a narrative approach that trusts atmosphere and abstraction over exposition. The combination of violence, “psychological violation,” and “sexual domination” positioned within a philosophical meditation on existence creates conceptual density unusual for the genre. Production values matter here: voice acting, original music composition, and frame-by-frame animation indicate this isn’t a static visual novel but an audiovisual experience demanding technical competence across multiple disciplines. The multilingual support (Simplified/Traditional Chinese, Korean) signals international development or deliberate cross-cultural positioning, adding production legitimacy.
This targets players seeking substantive challenge wrapped in existential dread—those fatigued by conventional dungeon-crawler narratives or romance-first structures who crave instead a work that treats grotesqueness and domination as philosophical inquiry rather than titillation. The “fable of annihilation and terror” framing appeals specifically to audiences comfortable with body horror, psychological unease, and ambiguous moral terrain.
A genuinely ambitious adult action game that refuses accessibility or conventional appeal: CYANBRAIN commits fully to its own decadence, and that conviction alone justifies the substantial production effort evident throughout.
Related Tags:
R18 | Animation | Action | Application | Music
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Official English version available ↓
