Seven years ago, Anemone’s father disappears, leaving his daughter with nothing but an app on her phone to support her. Now, she’s tasked with a pivotal role in the war against mankind’s enemy - a war which sees her subconscious sent into the midst of another world as humanity’s only truly effective weapon.
 
As unusual events within this other world unfold, so more and more questions are raised about Anemone’s life, as well as the nature of what she is truly fighting against. With seemingly endless possibilities stretching out before her, Anemone has an important choice to make - does she save the world, or the person she loves?

It all begins with the story that was left untold – the earth-shattering incident where Renton’s father disappeared. With the mysterious Eureka by his side, only Adroc Thurston could undo his own mistake, sparking the event that changed everything and earned him the title of a hero. Now, ten years later, Eureka lies in critical condition as Renton leaves the crew of the Gekko. But when he finds himself in the care of his father’s old friends, he has a choice to make. Either stay with the loving family he’s always wanted, or earn the love he seeks.

The virtual world inside the scub coral (intelligent coral-like lifeforms) created by Eureka... The people from that virtual world appeared on Earth ten years ago when it collapsed. Since this large-scale amalgamation, the humans from the virtual world call themselves "Green Earth" and the original Earth humans call themselves "Blue Earth," and they've come to cause various conflicts with each other repeatedly below the surface. Eventually, Dewey Novak, a senior officer in the Green Earth Armed Forces, rises together with his comrades and finally sets a large-scale terrorism plan into action in order to protect their own dignity. 
 
Meanwhile, Eureka, who is detested by the world as the main cause of the chaos, has become a high-grade combatant with the UN's A.C.I.D. unit. Live in order to keep this world at peace... This was the path of atonement she chose. One day, she receives an order to protect a girl named Iris, a new "Eureka" who has the ability to control scab coral. They fight a lot at first but gradually come to understand each other through their lonely escape. Soon the world faces a crisis, and when that happens, Eureka draws on every last ounce of her strength as she fights. "I want to protect Iris and this world." What future awaits her at the end of that wish of hers? 
(Source: Crunchyroll)

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