Reika &quot;Vision&quot; Chang is a character introduced in episode 7 of the OVA, she is a popular singer in America in her group known as Vision and the Revengers. She is the elder sister of Irene Chang, whom was killed in the 2nd episode of the OVA and Reika comes to MegaTokyo to get revenge on her younger sister&#039;s death by taking on GENOM. Reika has a concert in MegaTokyo planned, but it is only a ruse as she is only in the city to kill Quincy, president of GENOM. However her encounter with Irene&#039;s friend Linna, tries to persuade Reika that revenge is not the path she should follow, and her singing career should be the only path.    (Source: Wikipedia)

In the near future, Tokyo was left flattened as a result from a great earthquake. A new city, MegaTokyo, was then recreated due in no small part from the aid of a multi-million dollar company, Genom Corp. Genom created and mass-produced biomechanical creatures called Boomers to aid in the restoration of MegaTokyo. When the Boomers began to run out of control, the ADPolice at first tried to stop them, but they proved to be far more difficult to deal with than was first imagined. Under the ever looming Boomer threat, a group of four girls from varying degrees of society banded together. Calling themselves The Knight Sabers, they were the only ones with enough firepower and resourcefulness to defend the fledgling MegaTokyo from Genom and it's berserk Boomers.
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(Source: Anime News Network)

Reika Chang