The virtual reality created by Eureka has brought humans from two different worlds together. These people, known as Green Earth and Blue Earth respectively, have been in conflict with each other ever since their amalgamation. In an attempt to protect their own dignity, a senior officer named Dewey Novak of the Green Earth Armed Forces sets off a large-scale terrorism plan. Meanwhile, Eureka, who is blamed for causing chaos and destruction, has become a skilled combatant with the UN's A.C.I.D. unit. She takes on this role in order to maintain peace in the world.
One day, she receives an assignment to protect a young girl named Iris, who possesses the ability to control scab coral. Initially, Eureka and Iris clash due to their differences and feelings of loneliness. However, as they continue to work together, they come to understand each other better.
As time passes, the world faces a crisis that threatens its very existence. In response, Eureka draws upon all her strength and skill to protect Iris and the rest of humanity. Ultimately, she hopes to create a peaceful future for herself and those around her.