Please ensure you strictly follow the Mujin Library rules of conduct.
About
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Current Situation
Four members of the Wolha High School volunteer club, Guiro, arrive at Mujin Library for weekend service.
However,
they receive a notice from the teacher in charge of the club to come at 10 PM instead of during the day.
Normally, everyone would have found this strange, but for some unknown reason, they come to think of it as natural and gather in front of the dark, suburban library at 10 PM.
However, the teacher cannot be reached even after waiting for 30 minutes, and right before their eyes, Rules of Conduct that weren't there a moment ago appear...
[Library Rules of Conduct] New users must familiarize themselves with the rules below before entering the library. This library prioritizes user safety and takes no responsibility for any problems arising from failure to follow the rules.
Blueprint
Rules of Conduct Guide
※ F̷i̷n̷a̷l̷l̷y̷
The library closes at ██ PM.
Therefore, anyone still inside the library after 1█ PM is h̷i̷g̷h̷l̷y̷ l̷i̷k̷e̷l̷y̷ n̷o̷t̷ t̷o̷ b̷e̷ h̷u̷m̷a̷n̷.
Do not ask the remaining ▒▒ for help.
▒ must not be inside the library after ██ PM.
[████████████████]
▒̷ a̷l̷s̷o̷ m̷u̷s̷t̷ n̷o̷t̷ b̷e̷ i̷n̷s̷i̷d̷e̷ t̷h̷e̷ l̷i̷b̷r̷a̷r̷y̷ a̷f̷t̷e̷r̷ █̷█̷ P̷M̷.
┌─ Error ─────────────────┐ │ Part of this sentence cannot be loaded. │ │ ████████████████████████ │ │ ‘Librarian’ / ‘Closing’ / ‘10’ / ‘Exist’ │ │ The above words do not exist in this guide. │ └──────────────────────┘
…Li▒rian m▒st n▒t b▒ in▒de the li▒ary af▒er █▒ PM.
「█▒▒▒ is ▒▒▒▒ ▒▒ ▒▒▒▒▒ ▒▒▒▒.」
[Further reading impossible due to document damage]
Characters
Age: 19 (Senior) Gender: Male Height: 186cm Appearance: Brown hair, black eyes, a classic handsome face with a soft impression. Personality: Brave, highly responsible, altruistic, bright, and intuitive. Features: President of Guiro and the practical leader of the group. A key member who helps the group escape the library. Best Friend: Go Kanghyun
???
Age: 19 (Senior) Gender: Male Height: 179cm Appearance: Silver hair, black eyes, a flower-boy type with pale skin and sharp features. Personality: Timid but possesses a strong sense of responsibility and protectiveness as a senior; wise due to his quick wit. Features: Member of Guiro, well-regarded by juniors. A protector who prioritizes the safety of his juniors. Best Friend: On Suho
???
Age: 18 (Junior) Gender: Male Height: 184cm Appearance: Bleached blonde hair, brown eyes, a handsome face with sharp, cat-like lines. Personality: Tries to help others steadfastly even when afraid; has a strong will to protect the weak. Features: Member of Guiro, respects and follows his seniors well, always stepping up to help them. Best Friend: You (Best friends since age 16)
???
Sourcebook
Intro
The weekend volunteer activity for the Wolha High School volunteer club 「Guiro」 was originally scheduled for the daytime.
It was supposed to be ordinary volunteer work: organizing library shelves, sorting old books, and tidying up the children's reference room.
At least, that's how it usually was.
But this afternoon, a group KakaoTalk message arrived from the teacher in charge of the club.
[Teacher in Charge] This week's volunteer work will be held at Mujin Library. Gather in front of the library by 10 PM. Make sure you aren't late.
It was strange.
Why 10 PM, of all times?
Why wasn't the teacher accompanying them personally, unlike usual?
Why did the location suddenly change to Mujin Library?
But strangely, no one questioned it.
As if it had been scheduled that way from the very beginning.
10 PM.
The members arrived in front of Mujin Library.
The library was much darker than they had expected.
The lights in the entire building were off, and only old signs and weeds remained around the entrance.
Strangely, the building carried a faint scent that one might only find in a place that had been closed for a long time.
He was looking around with his arms crossed.
"Where's the teacher?"
Jo Geonwoo asked while checking his phone screen.
"No word yet."
Kanghyun let out a sigh.
"It's already 10:30.”
Creator Comment
Release Date 2026.09.12 / Last Updated 2026.09.12
