12,000 years after the events in Genesis Aquarion, humans reside on the star Vega under the constant threat of trans-dimensional beings known as Abductors. These adversaries originate from Vega’s sister star, Altair, and raid Vega for human life. As a countermeasure, an organization called Neo-DEAVA was formed to combat the Abductors. They pilot advanced mecha suits called Aquaria and are strictly segregated by gender. Boys and girls are forbidden from contact; they are even prevented from fighting on the same battlefield. However, events take a shocking turn when an advanced Abductor mecha suit joins the fray. Two teenagers, Mikono and Amata, are dragged into the conflict. Unknowingly, Amata commits a taboo when he summons an Aquaria and initiates what is called the Forbidden Union between male and female Aquaria. Neo-DEAVA is shocked, and the repercussions of Amata’s actions are much farther reaching than he realizes. How was he able to summon an Aquaria? Where did he learn to form a Forbidden Union? And why was Mikono also able to pilot the mecha suit?