Story~

See, Dural is actually Kage Maru's (the ninja dude) mother. She was kidnapped by this secret organization called, J6. Their intentions where to use a real person and to see if they can create the best fighter in the world. So, they added a chemical to her body and she was completely controlled by it. I'm not really sure why she has that silver coating on her body. (Not sure if it is VF2 or VF3, but there's a secret ending to her; where she starts to loose the silver coloring on her body and on the cutscene, you can see her real eyes). So, J6 next plan was to kidnap Sarah (Jackie's Bryant Sister) and then brainwash her and use her for a new experiment. So, this is where VF4 comes in. Jackie saves her, but, she can't remember anything. J6 suceeded with their plan, they created a whole army with Durals (that's why there's a stage where you fight at the end with dural. If you look at the back, you can see other durals being activated.) The lack of a detail story for the Virtua Fighter series, makes it hard to understand if this dural (from VF4) is kage's mother. My speculation is, he saved her in VF3, but J6 succeeded in grabbing enough information in making her a clone of her. My guess, VF5 is about revange. -Jackie trying to find his lost, confused sister, Sarah. But when he finds her, she doesn't want to talk to him. -Kage getting revange on J6 for doing this to his mother. LeiFei having doubts on killing Lauchan (J6 sent him to kill lauchan), but he can't admit he wants to be his deciple. -Lauchan want's to teach his grand-daughter Paichan his art, but, she is now slowly regaining her respect towards him. I think she'll get close to him even more when LeiFei tries to kill him in VF5 (she'll probably protect him or something, like in the Vf5 opening cutscene.) -Eileen tries to talk to her idol (pai chan), by participating in this new tournament. -Akira is still trying to find the meaning of what his grandfather told him (He told him that he still needs to find the meaning of what "true strength" is.) So, he thinks that by defeating Kage (his greatest rival since VF2), he'll find out the answer. -Can't say much about el blaze, jeffry, wolf and Brad. I can say that Aoi and Vanessa fall in love with Brad, so they fight it out with each other. While Brad just sits back and see who wins? I dunno, sounds like a dumb idea. Well, ether way, i can't wait for VF5 to come out on the PS3. I'm buying the system a week after the game is out.

EDIT!

I found a more detail information about Dural, in Wikipedia. "Dural was previously a human woman. Her name was Tsukikage and she was both Kage-Maru's mother and a Kunoichi. When the mysterious corporation J6 noticed her exemplary fighting ability and resilient body, they captured her and used her as their prototype for their terrifying Dural project. Arming her body with various cybernetic enhancements and brainwashing, she became a cyborg, immune to feeling. Technically, she underwent roboticization, though this isn't directly stated in the games.) She appears in both silver and gold skin, and she is an excellent fighter in the right hands. Since then, Kage has attempted to retrieve Tsukikage and restore her to her former self, finally succeeding in Virtua Fighter 3. However, he needed parts to keep her inhuman body operational, and when he retrieved them, she became even less human then before. Now Kage enters the 4th tournament to end his mother's suffering and return her to normal. Meanwhile, the J6 corporation has their eyes on Sarah Bryant as the subject for their next Dural project" http://en.wikipedia.org/wiki/Dural_(Virtua_Fighter)