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四合 Quadrangle
After waking up in a strange school, Muni sets out on a journey of intertwined fates to uncover the truth and save others. Every choice reshapes the future—an adventure where tenderness and danger coexist, and the truth hides behind every fleeting moment.
Release Date:
Q4 2026
Developer:
Publisher:
CLSTA
Teaser | Teaser Trailer
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Curator Review

Informational
By 游饼 October 30

“黑毛白毛美少女贴贴可太棒啦！

游戏介绍：在陌生的校园中醒来的秋木匿，为了寻找真相与拯救他人，踏上交错命运的解谜之旅。 每一次选择都将改变未来——温柔与危险并存的悬疑冒险，真相隐藏在每一个不经意的瞬间。

每日福利游戏激活码：CXNY5-NX3NM-IEALN 求关注~”

Features
Single-player
Captions available
Family Sharing
Steam is learning about this game 
Languages:
Interface Full Audio Subtitles
English ✔ ✔
Japanese ✔ ✔
Simplified Chinese ✔ ✔ ✔
Traditional Chinese ✔ ✔
This game is not yet available on Steam

Planned Release Date: Q4 2026

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About This Game

◆ Story

“In a world rewritten,
no one remembers the truth anymore.”

Muni wakes up in a school she’s never seen before.
She doesn’t remember who she is — or why she’s here.
Rumor says this academy hides a secret experiment,
and her arrival sets destiny’s gears in motion—
every choice changes someone’s fate, including her own.

To find the truth.
To save one life.
She must erase another’s existence.

⸻

◆ Features

  • A suspenseful story woven through multiple characters.

  • School × Mystery × Romance — where tenderness meets danger.

  • A branching and restart system leading to completely different destinies.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Some character CG drafts and partial visual materials were created with the assistance of AI tools.
Additionally, AI-generated voice lines were used for some characters.
No AI is used to generate content dynamically during gameplay.

System Requirements

Windows
macOS
    Minimum:
    • Requires a 64-bit processor and operating system
    • OS *: Windows 7 SP1 / 10 / 11 (64-bit)
    • Processor: Intel Core i3
    • Memory: 4 GB RAM
    • Storage: 4 GB available space
    Recommended:
    • Requires a 64-bit processor and operating system
* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
    Minimum:
    • OS: macOS 11
    • Processor: Apple M1
    • Memory: 4 GB RAM
    • Storage: 4 GB available space
    Recommended:
    * Starting February 15, 2024, the Steam Client will no longer support 32-bit games or macOS 10.14 or lower.
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