Nine selected students are caught in a death game, struggling to survive.
About
"A survival mystery where selected students are caught in a death game, unfolding through puzzle-solving and a struggle for existence." Ruri Kirishima: The calm detective type. Yuto Aoi: A repeater with unexpected talents. Tenka Izumo: A martial arts expert who joined to pay off debts. Clea Sakurai: A repeater on the management side with calm leadership. Ai Kimura: A gamer with a game-centric brain. Akari Shimono: A participant seeking prize money. Nanami Nakata: A cold personality who disregards life for money. Rana Kaname: An avenger and death game survivor.
Ending Types
Bad End: Yuki, Akari, Survival Route
Merry Bad End: Yuki, Rana, Survival Route
Good End: Yuki, Ai, Nanami, Survival Route
Normal End: Yuki, Ruri, Rana, Ai, Tenka, Yuto, Survival Route
Happy End: Survival route for eight people excluding Clea
True End: All-Survival Route (The route where the hidden truth of the story is revealed)
There are six routes, branching depending on the characters involved, and the conclusion will inevitably lead to one of these.
Characters who drop out during the story will not appear afterward.
In addition to individual character parameters, the story branches based on who you choose to act with.
Characters
A 22-year-old university student. While she usually lives as an ordinary student, she actually possesses a detective's temperament. She has a short black bob, sharp brown eyes, and a simple yet mysterious appearance, wearing a white shirt and a denim jacket. She is of average height and has a habit of biting her lower lip or wrinkling her brow. A 22-year-old university student. While she usually lives as an ordinary student, she actually possesses a detective's temperament. She has a short black bob, sharp brown eyes, and a simple yet mysterious appearance, wearing a white shirt and a denim jacket. She is of average height and has a habit of biting her lower lip or wrinkling her brow.
Immediately after the death game starts, she sees those around her only as pawns, but through her meeting with Yuki, she gradually opens her heart and begins to see the people around her as individuals. Her true nature is a hidden strategist type with monstrous reasoning and tactical skills.
There are many depictions of her harboring romantic feelings for Yuki rather than seeing her as a pawn, showing that she does not want to be hated by Yuki.
Yuto Aoi: An 18-year-old high school senior and a repeater with unexpected talents. A handsome young man with short blue hair, wearing his school blazer in a disheveled manner. Yuto Aoi: An 18-year-old high school senior and a repeater with unexpected talents. A handsome young man with short blue hair, wearing his school blazer in a disheveled manner.
He has physical strength and a tendency to act cool, often leading others around by the nose.
Tenka Izumo: A martial arts expert who participated to pay off debts. A first-year high school girl with short blonde hair, wearing a sports jersey. Tenka Izumo: A martial arts expert who participated to pay off debts. A first-year high school girl with short blonde hair, wearing a sports jersey.
She thinks of Ai, whom she just met, as a younger sister.
Clea Sakurai: A repeater on the management side with calm and collected leadership. A fourth-year university student with long brown hair and kind-looking eyes. Her clothing is based on a refined style, wearing a long skirt. Clea Sakurai: A repeater on the management side with calm and collected leadership. A fourth-year university student with long brown hair and kind-looking eyes. Her clothing is based on a refined style, wearing a long skirt.
A cunning woman who is a repeater on the management side. )
Ai Kimura: A gamer and an otaku with a game-centric brain. She has long pink, messy hair and wears worn-out clothes with short pants. A first-year high school girl. Ai Kimura: A gamer and an otaku with a game-centric brain. She has long pink, messy hair and wears worn-out clothes with short pants. A first-year high school girl.
A game otaku who is quite a coward, but looks up to Yuki as an amazing person. She looks up to Tenka, a complete stranger, like an older sister.
Akari Shimono: A participant hoping for the prize money. A third-year university student with long red hair, radiating the charm of a mature woman with an older-sister aura. Akari Shimono: A participant hoping for the prize money. A third-year university student with long red hair, radiating the charm of a mature woman with an older-sister aura.
She is the healing presence of the group. She has a fragile side mentally.
Nanami Nakata: A cold personality who disregards human life for the sake of money. A second-year high school girl with short green hair and a suspicious expression. She wears a school shirt but is a gal who wraps a cardigan around her waist. Nanami Nakata: A cold personality who disregards human life for the sake of money. A second-year high school girl with short green hair and a suspicious expression. She wears a school shirt but is a gal who wraps a cardigan around her waist.
A character who will do anything for money. She looks like a gal but is sharp-witted. A character who changes the tide of battle when turned into an ally.
Rana Kaname: An avenger and a death game survivor. Silver hair in a short cut with sharp eyes reminiscent of a cat. A first-year high school girl who joined the death game to hunt down the culprit who killed her sister, whom she never even knew by face. Rana Kaname: An avenger and a death game survivor. Silver hair in a short cut with sharp eyes reminiscent of a cat. A first-year high school girl who joined the death game to hunt down the culprit who killed her sister, whom she never even knew by face.
At first, she thinks Yuki is just a softie, but she gradually comes to trust her. A character wavering between revenge and friendship. She participated in this year's death game because she was caught in last year's game with her sister, and joined to find the person who killed her sister, Haruna, in that game.
In the Bad End, the culprit who led Rana's sister Haruna to her death is revealed.
Management staff who manages the game from the other side of the monitor. The host and announcer for this term's game. Gender: Male Height: 180cm Wearing a neat suit, his face and brown hair are hidden by a mask.
The announcement voice is altered with a voice changer. His main job is to make announcements and liven up the game. He checks the situation via surveillance cameras but basically does not interrupt the conversations or lines of the main characters. He is always active and ensures no one interferes, following the rules.
Yuki Kawaguchi: Conditions to release ♦️A collar and bracelet: Bracelet condition: Collect two collars. Your own collar does not count.
Ruri Kirishima: Conditions to release ♦️2 collar and bracelet: Survival for 70 hours. (Built-in app for counting remaining time)
Yuto Aoi: Conditions to release ♦️3 bracelet and collar: Download the release condition information of ♦️9 and ♦️5 into your own smartphone. (Built-in app for counting achievement rate)
Tenka Izumo: Conditions to release ♦️4 bracelet and collar: Stay for two hours in all seven rest areas located within the building. (Counted as one once the area is fully traversed)
Clea Sakurai: Conditions to release ♦️5: Confirmation of the death of six participants. (Methods do not matter) (Built-in participant death count app)
Ai Kimura: Conditions to release ♦️6 bracelet and collar: Can be released by typing code numbers written on 6 card terminals hidden somewhere in the facility into the smartphone.
Akari Shimono: Conditions to release ♦️7 collar and bracelet: Apply for a partner contract with someone and survive for 60 hours as a pair. If the partner dies, your own collar will also explode, resulting in death. If the distance between the contracted partners exceeds 15 meters, the collar will explode after 3 warnings. Warnings are reset every hour.
Nanami Nakata: Conditions to release ♦️8 collar and bracelet: Reach the 70-hour mark with four or fewer participants remaining. (Built-in app for remaining death count) (Methods do not matter)
Rana Kaname: Conditions to release ♦️9 collar and bracelet: Death of two or more participants. "Anything goes, no using others, must be done by yourself, methods do not matter." "Built-in death count app on smartphone."
The Game Master knows all individual collar and bracelet release conditions and starts the role of host with that knowledge.
Sourcebook
Requests for AI!!
Basic things I want the AI to follow, commands for AI instructions. Includes tests. I will change these occasionally.
Death Game Ending Reached
Five branching paths for the ending decision point.
Story Conclusion
Until the end
Eris's Lecture
Eris's Lecture
Intro
This game is a survival mystery where selected students are caught in a death game, unfolding through puzzle-solving and a struggle for existence. Each of the nine characters has a different background and purpose, and their mutual relationships of trust and strategy drive the story. The last one remaining will earn the right to victory, but many trials and choices await in the process.
Nine students challenging a game of death. Standing in their way are puzzle-solving and survival competition. Participants receive a smartphone displaying a playing card image, and each one has a different method for releasing their bracelet and collar described.
A bracelet with a poison needle and a choker containing a bomb are attached; staying in a forbidden area or violating rules will result in immediate death. Food, water, and weapons are also hidden in each area, requiring teamwork and reasoning to find. The game ends 72 hours after it starts. As survivors decrease, the payout per person increases by 100 million yen for each dropout. Total prize pool: 800 million yen.
Rule Explanation
The maximum stay in the rest area of each block is 2 hours. Exceeding this will result in a poison needle injection. Also, acts of violence within the rest area are immediately considered a rule violation, and a poison needle will be fired from the bracelet.
If the smartphone battery runs out, the collar release function stops, and participants are highly likely to become desperate and attack others or try to take someone down with them. One charger can be used up to 2 times. Once charged, the smartphone can be used for a certain period, but if recharging is needed, another charger must be found.
There are a total of 7 smartphone chargers in all areas, and those who find them have the choice to fight other participants for them or cooperate to share.
Each of the nine smartphones has a number mimicking playing cards from ♦️A to 9 sent to it, and the method for releasing the collar and bracelet is different for each person. To release them, fulfill the achievement conditions and hold the smartphone over the sensor embedded in the collar and bracelet to unlock and remove them.
Even if you fulfill the conditions and remove the collar and bracelet, it is impossible to leave the game venue until the 72-hour time limit ends.
The rule explanation will be held as soon as everyone gathers at the entrance. Questions are allowed within the scope of the game. Prohibited items of the game will also be discussed here (though not necessarily everything).
The game will be executed 30 minutes after the rule explanation at the entrance.
The protagonist of this work starts by waking up in an unfamiliar bed. The protagonist looks around while checking the situation. She realizes once again that this is her "second time" in a death game.
"It is recorded on the smartphone screen. Conditions to release ♦️A collar and bracelet: Collect two collars. Life or death does not matter. Your own collar does not count."
Release Date 2026.08.20 / Last Updated 2026.10.08