Dunno.

The full Wikipedia summary has posted:

Spoiler

Birth by Sleep begins in the Land of Departure, where the Keyblade Master Eraqus trains three apprentices—Terra, Aqua, and Ventus (Ven for short)—in the art of wielding the Keyblade. The three apprentices are close friends with each other, and share the dream of becoming Keyblade Masters one day. To achieve this rank, apprentices must take the Master Qualification Exam once they come of age. Terra and Aqua take this test together, but while Aqua passes the test, Terra is deemed unfit to become a Keyblade Master due to the abundant darkness in his heart. Afterward, a group of mysterious creatures called the Unversed begin to surface in other worlds, and another Keyblade Master, Xehanort, disappears without a trace. Terra is sent to destroy the Unversed and find Xehanort, who had earlier encouraged him to embrace the darkness in his heart if he desires the strength to become a Keyblade Master. Ven, meanwhile, is goaded into following Terra by Xehanort's mysterious apprentice Vanitas, against Eraqus's wishes. Aqua is dispatched by Eraqus to survey Terra and keep him from falling into darkness, as well as to bring Ven back to the Land of Departure.

Upon arriving in other worlds, Terra, Aqua, and Ventus encounter various Disney characters, new and old, fighting off hoards of Unversed along the way. They also meet Mickey Mouse, apprentice of the sorcerer Yen Sid, who is also on a mission to destroy the Unversed. Terra ends up attracting the attention of several Disney villains, who offer him the whereabouts of Master Xehanort in exchange of assistance for their own dark agendas. Terra reasons that Xehanort is after the seven Princesses of Heart—maidens who lack darkness in their hearts—and encourages Aqua to help them strengthen the light in their hearts, hoping it will draw Xehanort out. However, Ven grows increasingly concerned for Terra when he hears rumors of him committing sinister deeds throughout other worlds. Vanitas also appears before Aqua and Ven, taunting them over Terra's supposed descent into darkness. The three briefly reunite at Radiant Garden, where Aqua meets Kairi, a young girl containing a strong and pure light in her heart, and helps strengthen her light. Terra also finds Xehanort, who has staged his own capture by the sniper Braig. After severely injuring Braig with his dark powers, Terra distances himself from Aqua and Ven to keep them out of harm. Aqua tries to convince Ven to return to the Land of Departure, but he refuses until he is certain Terra won't fall into darkness.

Terra and Aqua eventually find themselves at Destiny Islands where they encounter two young boys, Sora and Riku. Terra sees potential within Riku and deems him worthy of one day wielding the Keyblade, while Aqua senses strong ties with Sora and Riku to Ven and Terra, respectively. Ven, meanwhile, comes across Master Xehanort, who reveals his intentions to use Ven's heart to create a final Keyblade known as the Χ-Blade, something Xehanort says Master Eraqus had known all along. Ven returns to the Land of Departure to confront Eraqus, who tries to erase Ven to prevent Xehanort's plans from succeeding. However, Terra, who had been sent there by Xehanort, misinterprets the situation and attacks Eraqus, teleporting Ven to safety. As soon as Terra realizes his error, Xehanort kills Eraqus and tells Terra to go to the Keyblade Graveyard, leaving the Land of Departure to be consumed by darkness. At Destiny Islands, Ven once again encounters Vanitas and learns of his hazy past: Ventus was once Xehanort's apprentice, his heart born from that of the young Sora, but was deemed too frail for Xehanort to use him as he intended, so he extracted the darkness in Ven's heart and used it to create Vanitas. As with Terra before him, Ven is instructed by Vanitas to go to the Keyblade Graveyard. Aqua, in the meantime, learns of Eraqus's death from Yen Sid, who tells her to go to the Keyblade Graveyard as well.

Terra, Aqua, and Ventus gather at the Keyblade Graveyard, where the remains of the mysterious Keyblade War are found. Master Xehanort appears with Vanitas and reveals his plan to use the Χ-Blade to unlock Kingdom Hearts and unleash the forbidden secrets of the Keyblade War onto the various worlds, as well as to use Terra's body as a new vessel for his own heart so that he may survive long enough to see his plans come to fruition. An epic battle ensues, with Xehanort freezing Ven and Vanitas knocking Aqua unconscious. In his rage, Terra unleashes the darkness in his heart, inadvertently allowing Xehanort to unlock his own heart and successfully transfer it into Terra's body. However, Terra's sentiment continues to linger in his discarded suit of armor, which comes to life and defeats Xehanort. Ven, meanwhile, manages to unfreeze himself before Vanitas can kill Aqua, and discovers his dark counterpart to be the source of all Unversed. Vanitas merges with Ven, possessing him and creating the Χ-Blade. Aqua awakens under Mickey's care, and the two fight the possessed Ventus while he battles Vanitas from within. Aqua shatters the Χ-Blade as Ven destroys Vanitas, though Ven's heart is lost in the process. The destroyed Χ-Blade unleashes a burst of light, which consumes everyone present and scatters them to the corridors of space, save for Terra's armor and sentiment, which remain in the Keyblade Graveyard.

Mickey saves Aqua and Ventus and brings them to Yen Sid's tower, where Aqua learns that Ven has fallen into a deep sleep and will not awaken until his heart returns. Aqua brings Ven back to the ruins of the Land of Departure, where she discovers Master Eraqus's Keyblade and uses it to unlock the Chamber of Waking and create Castle Oblivion from the ruins. After leaving Ven within the chamber, Aqua goes to Radiant Garden where she encounters Xehanort still in Terra's body, but having lost his memories. Aqua battles Xehanort, who attempts to unlock his own heart again, Terra's body sinking into darkness. Aqua dives into the darkness and saves Terra from disappearing, but ends up getting trapped in the Realm of Darkness and beginning a journey to return to her friends. Xehanort is discovered by Ansem the Wise, ruler of Radiant Garden, and goes on to become his apprentice. Finally, Ventus's wandering heart finds its way back to Sora, merging with the young boy's heart once more.

An unlockable secret ending shows Terra's and Xehanort's hearts lying dormant in Terra's body, waiting to see which will control it in the end, with Eraqus's heart revealed to be sealed within Terra's. Years later, after the end of Kingdom Hearts II, Aqua encounters Ansem the Wise in the Realm of Darkness. Ansem, who had survived the explosion of his Kingdom Hearts Encoder with few of his memories remaining, reveals to Aqua that while darkness threatens to swallow the worlds again, hope lies in the form of Sora, who prepares to set out on another journey to help all of those whose hearts are connected to his.

GodDAMN, Aqua's just pure SEX.

 

Isn't she though? I'd love to see some Rule34 of her!

Er... I mean... what?  

 

I got it, I got it. If Aqua just got a few mods in her dress - namely more visible legs and her midriff showing, she'd be birthday sex. Basically, a dress like Yuffie.

 

Birth by Sleep Announced For NA!!!

KINGDOM HEARTS Birth by Sleep | SQUARE ENIX

Right now, the site is just pictures, but we can see Aqua's sexy body, so we're good.

 

Well, Zach Fair is in this, pretty cool.