Infection

In a rundown hospital, Dr. Akiba refuses to admit a patient with a strange black rash and a burn victim in Room 3 dies after receiving an incorrect drug. The staff signs off on the death and begins a cover-up rather than report the cause. The incident marks the start of a spreading crisis.

Akiba and colleagues decide to conceal the death and relocate the body to an unused room to avoid questions. The team, including Uozumi and four nurses, works quickly to erase evidence. The atmosphere grows more tense as the incident is hidden from higher authorities.

The head nurse finds that the patient Akiba refused to admit has been left in the hallway and informs him. Akiba realizes the situation may be more dangerous than anticipated. The moment raises questions about who is truly in control.

Akai has taken the patient and Akiba decides to study the symptoms. The patient is still alive but his body mass is liquefying into green goo, signaling a terrifying infection. The doctors resolve to observe, even as the scene becomes more surreal.

The team agrees to examine the patient, but when they return to the room the patient has vanished and the head nurse lies unconscious. The investigation hints at a broader threat spreading through the hospital. Tension rises as the staff realize something is profoundly wrong.

The head nurse awakens acting strangely while green goo pours from her ears and eyes. The infection's reach becomes personal as staff fear they are next. The hospital scrambles to contain the emerging outbreak.

The mean nurse confronts the young nurse drawing blood on herself, and their conversation spirals into madness. The younger nurse laughs maniacally before stabbing herself with two needles, splattering green goo on her colleague. The scene deepens the sense of contagious horror.

While speaking with a patient, Uozumi is overcome with guilt, and Akiba finds him alone with a startling change. Uozumi's eyes turn white and green goo seeps from his body. The staff realize the infection is altering people in unpredictable ways.

The mean nurse becomes infected and, covered in green goo, is seen hanging upside down from the ceiling. Akiba flees the room as chaos breaks loose. The infection has reached peak surreal danger.

Akiba confronts Akai, accusing him of creating and spreading the virus. Akai denies it and explains that the infection spreads mentally, targeting subconscious thoughts. He urges Akiba to remember what happened in Room 3 earlier that night.

Dr. Nakazono walks in and finds Akiba talking to himself, realizing he has been speaking with his own reflection. She discovers the corpses of the two nurses, dead and untouched by green goo, and suspects a hallucinatory fever. A police call interrupts the scene.

Nakazono reveals that the last few hours were a hallucination and the police are called. Akiba recalls that Akai was the burn patient, and the same events replay with swapped identities, culminating in a massacre of the staff. The film reveals the infection as a psychological phenomenon rather than a simple contagion.

The hospital is evacuated the following day while most staff lie dead except Nakazono, and investigators search for Akiba who has vanished. The surviving doctor contemplates the scope of the disaster and the missing killer.

As Nakazono leaves, red lights invert to green and she panics, cutting her hand, and green blood pours out. The hospital's atmosphere is permanently unsettled as reality seems to fracture. The visual motif signals that the danger lingers.

A locker in the room where the burn victim was kept opens to reveal someone inside calling for help as green goo pours out. Akiba's goo-covered hand emerges from the locker before dropping back to the floor. The ending hints at a final, unresolved terror.