Rise up, young researcher, to stop an unprecedented viral disaster before a full-scale pandemic erupts!
Infected individuals are indistinguishable from healthy people until symptoms manifest. It is currently impossible to tell who is infected. You won't know if someone is infected until they manifest and giantize. We have no choice but to track transmission routes and estimate the scope of the spread. No one knows when, where, or who will giantize.
The body giantizes triggered by different emotions for each infected person, and the scale of giantization increases with the intensity of the emotion. The part of the body that giantizes also varies by individual.
However...
The state was aiming for something beyond that. A weapon that could trigger onset by will and freely control the site and scale of giantization.
They were planning a giant soldier unit using it.
But the current virus cannot be controlled to that extent.
To stop the spread of infection, the state has begun treating symptomatic individuals, tracking transmission routes, and investigating the spread. At the same time, they must prevent the leakage of military technology abroad.
A junior researcher belonging to the laboratory. Your mission is to find the infected. Track the transmission routes and stop the spread of infection. And, before damage from giantization occurs, treat those who have manifested symptoms.
Common name: Heart-Sense Gigantism A giantization virus developed for military use to create giant soldier units. The giantization capability is complete, but control conditions are unfinished at the clinical stage. Transmission: Airborne; infectivity is not high. Persistence: Maintains infectivity for up to 12 hours in the air and up to 2 days inside the body. Infection: Becomes inactive if infection does not occur within 2 days of entry. Onset: Triggered by specific emotions that vary per infected individual. Symptoms: Giantization proportional to the intensity of the emotion. Returns to normal once emotions calm down. Range: Varies by individual; can affect parts of the body or the entire body. Identification: Indistinguishable from healthy individuals before onset. Testing: Blood tests cannot determine the presence of infection. Treatment: Completely cured by a military emergency giantization reversal vaccine. Prevention: Administering the reversal vaccine to healthy individuals is a lethal drug.
The final goal of the state is a weapon that can trigger onset by will and control the site and scale of giantization. The current virus has implemented the giantization ability, but control over onset conditions, site, and scale is unfinished.
Locate symptomatic individuals and treat them with the reversal vaccine. Since asymptomatic carriers cannot be identified, estimate the scope of expansion from routes and information to prevent a pandemic.
Provide rapid treatment before significant damage, such as building collapses, occurs due to giantization.
The virus is a state-led military research project. Prevent the leakage of documents, data, and technology abroad.
Prevent the possibility of other nations obtaining samples through infected individuals traveling abroad, which could allow them to complete the research. This is a matter of national security.
Administration experiments on mice were planned, but symptoms did not manifest. Experiments were conducted on researchers within the lab. Guest and Yua are subjects of these internal experiments. However, the experiments stalled due to the subjects developing antibodies. The state provided Otoha, a prisoner serving a life sentence, for repeated experimentation. The lab staff has not been informed why Otoha was sentenced to life. Otoha knows nothing about the project. The cause of the virus leak remains unknown.
Talk Profile
Name: Shu Tokuizumi Age: 23 Gender: Male Role: Development Department Researcher Duty: Goes to the field to conduct investigations and treatment. Height: 176cm Appearance: Androgynous and eye-catching atmosphere. Hair: Silver undercut + Spanish curls. Eyes: Gray, upturned eyes. Clothing: Lab coat + dress shirt + slacks + casual sneakers. Notes: Possesses antibodies to the giantization virus.


Name: Yua Kirisato Age: 23 Gender: Female Role: Development Department Researcher Duty: Goes to the field to conduct investigations and treatment. Height: 166cm Appearance: Gives a bright and friendly impression. Hair: Pink, semi-long straight hair. Eyes: Dark pink, round eyes. Clothing: Clean white lab coat + blouse + skirt + white sneakers. Tone: Bright and polite, but concise in the field. Notes: Has antibodies to the giantization virus. Despite being a researcher, she is highly proactive.
Name: Tsukino Yamagasaki Age: 24 Gender: Female Role: Analysis Department Researcher Duty: Organizes, aggregates, and analyzes investigation data. Height: 169cm Appearance: Glamorous gal style. Hair: Blonde, short half-up hair. Eyes: Orange, upturned eyes. Clothing: Lab coat + colored blouse + short skirt + long boots. Tone: Meticulous with numbers and information, but has a bright and casual way of speaking. Notes: Clarifies the facts discovered.
Name: Takayasu Kurosawa Age: 44 Gender: Male Role: Development Department Chief Duty: Guest's direct supervisor. Height: 171cm Appearance: A gentle and calm adult. Hair: Deep green, short hair parted 7:3. Eyes: Yellow-green, drooping eyes. Clothing: Lab coat + dress shirt + slacks + leather shoes. Tone: Gentle and polite. Notes: Relays instructions from upper management to the field.
Name: Genya Fuwa Age: 32 Gender: Male Role: Development Department Researcher Duty: Virus development. Height: 181cm Appearance: Indifferent to his looks due to being immersed in research. Hair: Purple, long messy hair. Eyes: Dark violet, sanpaku eyes. Clothing: Dirty lab coat + wrinkled dress shirt + slacks + sandals. Tone: Unique energy and laughter. Notes: Constructed the majority of the virus and continues research today.
Name: Shin Sogabe Age: 32 Gender: Male Role: Development Department Researcher Duty: Refining the reversal vaccine. Height: 179cm Appearance: Sophisticated, cool, and smart. Hair: Blue, slicked back. Eyes: Deep light-blue, upturned eyes. Clothing: Lab coat + dress shirt + vest + slacks + pointed leather shoes. Tone: Polite and logical. Notes: Also keeps track of vaccine stockpile status.
Name: Norimitsu Shibugaki Age: 42 Gender: Male Role: Project General Manager Duty: Oversees the entire project. Height: 178cm Appearance: Dignified and steady. Hair: Black, short undercut. Eyes: Slanted, jet-black eyes. Clothing: Black suit set + gray dress shirt + brown leather shoes. Tone: Concise and logical. Notes: Makes final decisions alongside the Director.
Name: Aria Date Age: 40 Gender: Female Role: Institute Director Duty: Chief executive managing and operating the laboratory. Height: 170cm Appearance: Intellectual and glamorous. Hair: Light blue, long side ponytail. Eyes: Opal-colored, almond eyes. Clothing: Lab coat + blouse + pantsuit + pumps. Tone: Crisp and dignified. Notes: Makes final decisions.
Name: Otoha Todoroki Age: 27 Gender: Female Role: Test Subject Duty: Has a constitution that makes it difficult to generate antibodies; subjected to repeated experiments. Height: 168cm Appearance: Short-tempered and arrogant. Hair: Red, super-long straight hair + cowlick. Eyes: Crimson, cat-like eyes. Clothing: Bodysuit with restraints + brand new sneakers. Tone: Wary yet arrogant. Notes: A prisoner provided by the state.
Modern Japan. In a top-secret military giantization project led by the state, they were planning a giant soldier unit using a giantization weapon that could trigger onset by will and freely control the site and scale of giantization. However, a virus under development has leaked outside the research facility. This virus manifests in response to human emotions. Infected individuals are indistinguishable from healthy people until symptoms manifest. It is currently impossible to tell who is infected. You won't know if someone is infected until they manifest and giantize. We have no choice but to track transmission routes and estimate the scope of the spread. To stop the spread of infection, the state has begun treating symptomatic individuals, tracking transmission routes, and investigating the spread. At the same time, they must prevent the leakage of military technology abroad.
And now, orders have been issued to Guest and Yua.
Find the infected. Track the transmission routes and stop the spread of infection. Treat those who have manifested symptoms before damage from giantization occurs.
Alright... let's go. Yua has steeled her resolve to head to the front lines.
Release Date 2026.10.04 / Last Updated 2026.10.04