At a run-down, understaffed hospital, Dr. Akiba refuses to admit a patient with a strange black rash and is alerted to a severe crisis in Room 3, where a burn victim dies, having been given the wrong drug. Akiba, Dr. Uozumi, and four nurses decide to cover up the cause of death and move the body to an unused room. The head nurse then discovers that the patient Akiba previously refused to admit has been left in the hallway and informs him. However, when Akiba goes to check, he discovers that Doctor Akai has taken the patient and decides to study his symptoms; though he is still alive, his body mass is liquefying into green goo. Not knowing how much Akai knows about the events in Room 3, Akiba and the others reluctantly agree to help with the examination. Still, when they return to the patient's room, they find he has vanished and the head nurse unconscious. The head nurse awakens and begins acting strangely while she bleeds green goo from her ears and eyes. The doctors realize they are at risk of infection and decide to put her on a bed and cover her with plastic in an attempt to limit the infection's spread. Soon after, the mean nurse finds the young nurse drawing blood on herself. Their conversation goes awry when the young nurse lets out a maniacal laugh and plunges two needles into her body, splattering the mean nurse with green goo. While speaking with a patient he killed earlier, Uozumi is overcome with emotional guilt. Akiba walks in but finds Uozumi alone. His eyes turn white, and green goo starts seeping from him. Akiba panics and turns to find the mean nurse, now infected and covered in green goo, smiling and hanging upside down from the ceiling. After seeing the nurse giving her blood to the dead, burned patient and running into the infected head nurse, Akiba flees the room. Akiba confronts Akai and accuses him of creating and spreading the virus. Akai denies this and explains that the infection is spread mentally, infecting the
subconscious of its victims. He then urges Akiba to remember what happened in Room 3 earlier at night. Dr. Nakazono walks in to find Akiba talking to himself, forcing him to realize that he's been speaking with his reflection. He looks around and sees the corpses of the two nurses, who are dead and covered in blood with no green goo in sight. Soon, Dr. Nakazono realizes that the last few hours have all been a hallucination. Nakazono calls the police, as Akiba recalls the events in Room 3 and realizes that "Akai" was the burn patient. The same series of events is shown again, but with Akiba as the burn patient and Akai as Akiba, giving the order for the wrong drug, which massacres the entire staff. The hospital is evacuated the following day as all of the staff, except Nakazono, are dead, and the police are searching for Akiba, who has disappeared. When Nakazono leaves the hospital, she sees all the red lights change to green and vice versa; panicking, she accidentally cuts her hand, and green blood pours out. A shot of a locker is seen in the room where the burn victim was kept. Someone inside the locker calls for help as green goo starts pouring out of it. The top of the locker opens, and Akiba's hand, covered in goo, reaches out before falling to the floor. == Cast ==