A virtual world in a scab coral (coral-like information life form) created by Eureka. Ten years have passed since the people of the virtual world appeared on this earth with the collapse. As a result of this "great fusion", human beings in the virtual world call themselves "Green Earth", and human beings on the old Earth call themselves "Blue Earth", and various collisions will be repeated under the surface of the water. And Dewey Novak, a high-ranking official of the Green Earth Army, raises up with his colleagues to protect their dignity and finally puts into action a large-scale terrorist program.

Eureka, who is hated by all over the world as the cause of the turmoil, was a senior combatant of the United Nations independent division unemployed unit ACID. Live to keep this world peaceful. That was Eureka's path of atonement. Eureka is ordered to protect the new "EUREKA", a girl iris, who has the ability to manipulate scab corals. The two, who were initially in conflict, gradually understand each other through a lonely escape. And when the world faces a crisis, Eureka fights with her own strength to the limit. "I want to protect Iris and this world." The future to wait for the ends of the wishes of Eureka.