While being chased by Misaki, Ms. Yuri accidentally runs into Ms. Mari. Although Ms. Yuri threatens Misaki by using Ms. Mari as a shield, she is finally cornered and unable to escape. Ms. Mari then reveals the truth that she thought her twin younger sister Ms. Yuri had died 15 years ago in a plane crash.
At the same time, Ms. Yuri tells how she was ressurected by a being called Duo, and given superhuman abilities. She, along with Dr. Regal, were then raised by their foster father; none other than Dr. Wily himself!
Having thought to be dead after being hit by a truck, Ms. Yuri miraculously revives and escapes. Later, Ms. Mari is out with Lan and his friends when a Dimensional Area appears midway over a bridge, trapping them inside!
Ms. Yuri uses a Dark Synchro Chip in order to try to kill her only sister Ms. Mari, by the orders of Dr. Regal. However, Ms. Yuri's memories are coming back to her! Can she still do it? Even if she fails, Dark ProtoMan is dispatched to make sure that either way, Ms. Yuri or Ms. Mari will die.