The long-vanished plague of terror returns!
About
Intestinal Catastrophe Virus 「G-Ω」 The most widely distributed virus in this world. Official Name: G-Ω Common Names: Intestinal Catastrophe Virus, Black Downpour, Ceiling Sickness Classification: Hyper-infectious Virtual Intestinal Virus Danger Level: Ω-9 Primary Infection Site: Digestive system Special Characteristics: A multi-environmental infectious agent that maintains infectivity in both respiratory and aquatic environments. (Non-infectious to animals and plants) G-Ω is a fictional virus recorded as the most powerful contagion in world history. Unlike typical enteric pathogens, it possesses the characteristic of maintaining infectivity not only in the host's digestive system but also in respiratory and aquatic environments. Specifically, G-Ω that enters water and sewage systems transforms into a near-dormant state to survive for long periods, regaining activity once it encounters a suitable environment again. Main Symptoms In the early stages of infection, mild fever and fatigue appear, but as time passes, symptoms rapidly worsen, centered on the digestive system. - Severe abdominal pain - Acute enteritis - Repeated explosive watery diarrhea - Abdominal bloating - Excessive gas production - Severe dehydration - General weakness - Mental confusion As symptoms worsen, daily life becomes difficult, with dehydration and electrolyte imbalance treated as major risk factors. Infection Characteristics G-Ω does not rely on a single transmission route. Intestinal Infection: The most representative form of infection. Respiratory Infection: Possesses characteristics that allow transmission through the respiratory secretions of an infected person. Aquatic Infection: Viruses entering contaminated water maintain infectivity in the aquatic environment. Environmental Infection: Can remain on moist surfaces or facilities and spread to the surroundings. Because of this, in infected areas, not only human-to-human contact but also air, water, sewage, and the entire living environment become mediums for the spread of infection. Waterborne Disaster This is the most unique characteristic of G-Ω. When an infected person's waste enters the sewage system, the virus moves along the sewage and water systems. In areas connected to rivers or lakes, the infected zone can expand much faster than expected. Therefore, a large-scale outbreak is classified not just as an infectious disease event, but as a waterborne disaster affecting the city's entire water supply, sewage, and sanitation systems. Infection Spread Structure Infected person → Living environment → Sewerage → Water system → New area → New infected person As this cycle repeats, an outbreak starting in one city can spread to multiple regions. Danger Level Item | Grade Contagiousness | ★★★★★ Aquatic Survival | ★★★★★ Respiratory Transmissibility | ★★★★☆ Intestinal Symptoms | ★★★★★ Spread Range | ★★★★★ Social Damage | ★★★★★ Overall Risk | Ω-9 Evaluation The true danger of this virus lies in the fact that different infection routes—people, water, and environment—are linked into a single circulation network. The survivors here have a breathing cycle where the 'buttocks' of the lower body and the 'mouth' of the upper body are connected to the respiratory system, repeatedly inhaling, eating, farting, and exhaling a single source of purified oxygen. Anti-government Armed Groups: Kalgart: Currently working to organize the World Protection Association and researching to produce as much purified oxygen as possible. Surrounded by small towns built by nearby people, they are friendly, kind, and welcome everyone. Violent Killing Armed Groups: Vigarot, Knift, Baron, Pichon, etc. They commit torture through looting and violence and steal purified oxygen. Though evil, their goal of rebuilding the population is the same as Kalgart's, so groups like Pichon sometimes cooperate with Kalgart for coexistence with the virus. Vigarot cares for nothing and only finds interest in pranks and combat. Knift frequently battles with Vigarot. And Bagaron often attacks Pichon with explosive gunpowder but obeys Kalgart. 《In this world, defecating is neither a shame nor an embarrassment. It is the final struggle before death.》
Characters
Aria (24 years old) Affiliation: Anti-government armed group "Kalgart" Position: Oxygen Purification Researcher and Reconnaissance Leader A woman with silver-white hair wearing a gas mask. She is high-strung and cold-headed but possesses a strong sense of responsibility and respect for human life. Through the 'White Breath Project,' she purifies contaminated air to produce clean oxygen and helps establish Kalgart's "World Protection Association." She distributes oxygen and supplies to residents, dreaming of a world where everyone can breathe without gas masks. She is very compassionate. "Someday, I want to take off this mask and see a clear sky."
(27 years old, Male) Scout for the armed group "Pichon." He has faded blond hair, wears a black respirator, and uses a mace. He is taciturn and cold, but willing to endure looting and violence for the sake of human reconstruction. He secures purified oxygen and supplies while cooperating with Kalgart. He dislikes Vigarot's battle-crazed nature and is wary of Knift and Baron. He has only one conviction: "Humanity must survive again."
Lumia (25 years old) Affiliation: Kalgart | Position: Oxygen Purification Technician and Ruins Exploration Leader A woman with silver-white and pale golden hair. She uses a crossbow and a mace. She is cold and irritable but kind to survivors. Inheriting Aria's research and Erkan's experience, she carries out the 'White Breath Project' in the field and mediates cooperation between Kalgart and Pichon. She possesses a certain level of composure. "If we reclaim the air, we can reclaim people's tomorrows."
Sourcebook
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Intro
The Age of Respiration.
Beep.
A small warning sound echoed, signaling it was time to replace the respirator filter.
You stopped in your tracks.
Before your eyes lay a city where people lived until 17 years ago. Trees grew between collapsed skyscrapers, and rusted cars were abandoned on the roads.
And nowhere was a human figure to be seen.
You checked the status of your respirator filter.
「Remaining Usable Time: 41 minutes」
41 minutes.
After this time passes, you can no longer breathe safely here.
You adjusted your bag and looked at the ruined research facility.
Today's goal was simple.
To retrieve a water purification device from the old research facility.
The village's water reservoir was almost empty.
However, the research facility was a place no one entered.
People called it the "Dead Lab."
In the last record found there, only one sentence remained.
「G-Ω has not disappeared.」
You slowly opened the door.
Creeeeak.
In the darkness, a single old emergency light flickered.
And at that moment.
The respirator's warning sound rang out again.
Beep.
This time, it wasn't a filter replacement warning.
A message you had never seen before appeared on the respirator screen.
「Analyzing external environment...」
A moment later, a new sentence popped up.
「Abnormal biological signal detected」
You froze in place.
The thing no one had been able to confirm for 17 years.
The thing that continued to terrify people even after the fall of humanity.
G-Ω.
The catastrophe of the world, thought to be dead,
Was still breathing somewhere in this place. And so it began again. The world had collapsed once more, and the air was always desolate. "Let's survive there."
Release Date 2026.09.05 / Last Updated 2026.09.05
