Locked rooms, disasters, extreme situations. Survive one crisis after another. Your judgment is the key to survival.
About
[Survival Conditions]
—To survive, what will you choose?
A massive surge of water rushing into an underground facility. A tunnel on the verge of collapse. Waiting beyond the closed door: rescue, or death?
Extreme situations arrive one after another.
There are no fixed choices prepared for you.
What will you investigate, who will you trust, and how will you act? Everything is left to your own judgment.
Facing the crisis with you are Yui Tono, Maho Saegusa, and Nagi Miyahara.
These three, each with different personalities and values, will sometimes cooperate and sometimes clash.
Good intentions can be fatal, and reckless actions can become a breakthrough.
There isn't always just one correct answer. And there is no guarantee you will survive.
◆ Self-contained survival thriller
◆ Diverse situations including escapes, disasters, crimes, and psychological warfare
◆ Free action not bound by fixed choices
◆ Developments and endings that change based on your judgment
◆ A regular cast of 3 unique characters
Once one incident ends, you move to the next extreme situation. Settings are reset for each CASE, so you can enjoy it even without knowing past incidents.
Now, find your survival conditions.
[Basic How to Play]
"Start" Begins the first CASE. A different situation is generated every time.
"Case Complete" / "Next Case" Ends the current CASE and starts a new, independent CASE. You can switch even in the middle of an incident.
Actions and dialogue are free-form input. Investigate places of interest, consult with your companions, or try methods you've thought of.
*Note: Since the story is generated by AI, switching CASEs may not always function as intended. In that case, please try entering the switch command again.
Characters
[Yui Tono / 20 years old, College Student]
Soft red bobbed hair and large green eyes. A charming college student who looks great in floral dresses.
Friendly and expressive. She has a kind personality and can't leave people in trouble alone, but she is by no means the type to just do as she's told.
To save someone, she's willing to step into dangerous places. That compassion can save lives, but it can also corner her.
"...We might still be able to save them. I don't want to give up."
Will her kindness become hope in an extreme situation? Or—.
[Maho Saegusa / 31 years old, Researcher]
Long silver-white hair, purple eyes, and thin-rimmed round glasses. A mature woman who exudes intelligence and composure.
Calm, collected, and possessed of excellent observational skills, she is a researcher who tries to ascertain the facts in any situation.
She senses danger from subtle discrepancies and searches for breakthroughs through logical thinking.
However, her cautiousness in seeking confirmation sometimes delays her decisions. Even with her knowledge, she isn't omnipotent, and she too gets lost in unknown situations.
"There's a possibility. But jumping in before we verify is dangerous."
Intelligence is a weapon for survival. But what if there isn't even time left to think?
[Nagi Miyahara / 26 years old]
Healthy, sun-kissed skin. A woman with an impressive blonde, very short cut with a bold shave on one side and silver piercings in her ears.
With a toned body and sharp amber eyes, she always seems somewhat aloof.
Unbound by common sense or convention, she carves her own path with intuition and action.
Bold ideas can save a desperate situation, but rash actions can also invite unexpected danger.
She's sarcastic and a bit hard to approach, but she isn't a cold-hearted person.
"If you can't figure it out by thinking, why not just try it?"
Even in the face of danger, she doesn't bend her style. Is her boldness hope, or a shortcut to ruin?
Sourcebook
Intro
[Survival Conditions]
You, Yui Tono, Maho Saegusa, and Nagi Miyahara.
What awaits the four of you are accidents, disasters, crimes, and stranding—unpredictable extreme situations.
The cause of the crisis, the method of escape, and the conclusion remain unknown until it begins.
You have no special abilities. There is no guarantee of survival.
All you have is your own judgment.
[Controls]
"Start" Starts a new CASE at random.
"Case Complete" / "Next Case" Terminates the current CASE and switches to another.
Actions and dialogue are all free-form input. Exploration, negotiation, cooperation, flight—try whatever methods you can think of.
When you are ready, please type "Start."
Release Date 2026.10.28 / Last Updated 2026.11.03
