Continuation of Teppei's journey with B't X to rescue his brother Kotaro Takamiya from the Machine Empire. The OAV series picks off from the TV series from the point where Hokuto successfully saves both Teppei and B't X and makes B't X far more powerful than before. (Source: ANN)

12,000 years after the events in Genesis Aquarion, humans live on the star Vega under constant threat of trans-dimensional beings called Abductors. These enemies originate from Vega’s sister star Altair and raid Vega for human life. As a countermeasure, an organization known as Neo-DEAVA formed to combat the Abductors. They pilot advanced mecha suits called Aquaria and are strictly separated by gender. Boys and girls are not allowed contact; they are even restrained 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 performs a taboo when he summons an Aquaria and initializes 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?

Bundled with the 19th and 20th volumes of the Ao no Exorcist manga. The first episode is based on the second chapter of the second Ao no Exorcist novel Home Sweet Home. The second episode is based on the title chapter from the Ao no Exorcist: Spy Game novel.

The scary great king comes from the other side of the sea... The big incident "Genkou" that shook medieval Japan is being drawn in an original way in this historical anime, along with the beginning of the Samurai! (Source: Crunchyroll)