Aya Brea is back to defend the world from the mitochondrial menace in Parasite Eve II. This story takes place three years after the New York incident of the first game, when the horrible mutations are supposedly a thing of the past. Now working for the FBI in Los Angeles, Aya is called on to join the Mitochondrian Investigation and Suppression Team (MIST) to hunt down dangerous monsters and keep the disease from spreading. To do that, she must unravel the conspiracy that seeks the destruction of all mankind.