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Parasite Eve (パラサイト・イヴ?) is a survival horror role-playing game developed by Square USA and published by Square (now Square Enix). The game is a sequel to the novel Parasite Eve, written by Hideaki Sena. It is the first game in the Parasite Eve series. In the North American market the earlier copies were packaged with Squaresoft on PlayStation 1998 Collector's CD Vol.1; a collection of demos of future Squaresoft games. This is the first Squaresoft game to be rated Mature by the ESRB
The game begins with Aya Brea, an NYPD rookie, attending an opera with an unnamed date. During the opera, everyone in the building spontaneously combusts, except for Aya, her date, and an actress on stage named Melissa Pearce. Aya confronts Melissa backstage, and Melissa says that Aya’s mitochondria need more time to develop. Melissa then mutates into a beast and flees into the sewers, declaring that her name is now Eve.
The next day on Christmas, Aya and her partner Daniel go to see a scientist at the Museum of Natural History named Dr. Klamp. He tells them things about mitochondria that they find useless for their purposes. Later that day, they hear that Eve is in Central Park and to make matters worse an audience has gathered at the parks theater intending to see a performance that Melissa Pearce was to give. Aya enters Central Park alone as Daniel is unable to pass through the entrance without spontaneously combusting. She makes it to the theater but is too late to stop Eve, who causes the theater audience's mitochondria to rebel against their hosts and turns the crowd into a slimy orange mass. Aya chases after Eve and is knocked unconscious in a fight.
Daniel discovers that his son, Ben, was at the park but had left the audience at the Central Park theater when he began to feel ill and when his mother began to act strange. He also learns that Manhattan is being evacuated due to the threat that Eve poses. While Manhattan is being evacuated, a Japanese man named Kunihiko Maeda manages to sneak into the city, witnessing a police officer combust into flames in the process.
Aya awakens in an apartment with Daniel and Maeda at her side. Maeda reveals the origins of Eve. A scientist tried to culture the cells of his wife after she was involved in a car accident, and the mitochondria in her cells took over her body. Maeda believes that Eve may be trying to give birth to an “Ultimate Being.”
The next day, the three go to see Dr. Klamp again, and he tells Aya that the nuclei in her cells are fighting Eve’s mitochondria. After he asks a few questions of her, they leave Dr. Klamp and head for the hospital, where Maeda thinks Eve may try to get sperm for the Ultimate Being. When they arrive, they find that Eve is already there. Eve takes the sperm and escapes.
The next day, Aya discovers the orange mass of people from the park enter the city water supply. She goes to Dr. Klamp one more time, and discovers that Dr. Klamp has engineered special sperm for Eve so that she can create the Ultimate Being. He then spontaneously combusts. Aya finds Eve in another part of the museum, where the orange mass has surrounded her, forming an impermeable shield to protect her while the Ultimate Being gestates in her.
After several failed attempts to attack Eve, the military asks Aya to attack her from a chopper, as she is the only one who can get close without combusting. The plan works, but Aya has to personally finish the fight on a now-wrecked Statue of Liberty, where Eve finally succumbs.
As Aya rests on a naval vessel, the Ultimate Being is born and attacks the surrounding ships. Aya does battle with the Ultimate Being, but its mitochondria causes it to evolve at an alarming rate. Aya sets the vessel's boiler pressure dangerously high, so as to destroy it with the Ultimate Being onboard.