From "Kamen Rider Double".

Virus Dopant:

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The Virus Memory normally enables the Virus Dopant to unleash a plague that can wipe out an entire city, yet is weak against fire-based attacks. The Memory came into the possession of Sachi Yamamura, shortly after she saw that her fiance was a con man who uses women. While on her way home, having second thoughts about using it to exact her revenge, she is run down by a car driven by a group of thugs. Before she is hit, she uses the Gaia Memory but becomes comatose before the transformation completes. However, her consciousness enters a wrecked SUV with strange markings, known as the "Infected Car", which is rebuilt and she uses her brother's emotions to make him drive the Infected Car to take revenge on the thugs until Kamen Rider Double destroys the Infected Car. She then uses the Virus Dopant's physical form to chase after her fiance, becoming consumed by the Gaia Memory, until it is destroyed by Kamen Rider Double HeatTrigger's Trigger Explosion Maximum Drive.

©Toei