At the beginning of the 21st century, biochemical technologies that can extend human lifespan have been promoted all over the world. At the same time, the robotics manufacturing industry has also become the leader in this field by virtue of its strong technical strength, dominating the global market.
Because of the serious dangers of these technologies, the United Nations has passed strict international agreements. Japan, whose interests have been damaged, is dissatisfied with this and angrily withdraws from the United Nations. Then, Japan took an extreme action that shocked the world-lock the country!
In 2067, Japan used high-tech means to successfully build a mask-like device around the country. Since then, after Japan has hidden its mystery, other countries can no longer know its internal situation.
Ten years later, the US special force "Sword" was ordered to sneak into Japan to conduct investigations. Under the command of the captain Ryan, the team members launched an action, and the figure of the female soldier Vekhill was among them.
However, Japan has long been aware of this action. Waiting for the intruders are Saito and his guards, the head of Yamato Heavy Steel, a large Japanese company that has already controlled Japan. Under the cover of Ryan and the help of the mysterious Japanese woman Maria, Vickhill infiltrated Japan alone.
When she set foot on the land of Tokyo, she was surprised to find that everything in front of her was far beyond imagination, and the actual situation in Japan was completely different from outside predictions. Vichill followed Maria’s secret organization and gradually learned about Japan today. She discovered that Yamato Heavy Steel is conspiring to conduct a large-scale experiment in Japan and is preparing to further promote it to the world. In order to stop Yamato Heavy Steel's conspiracy, Vekhill and his companions started fighting.
