For some time Kazuma was he was thrown from world to world without any control or knowledge of a keyblade when the Darkness threatend to destroy the world he is in. Destiny islands was the last place he landed in and there the darkness had not set foot so that world became his home.

There he made two friends named Jaden and Yuzu. He was the older one of the three but also often lazy at times but they know they can relay on him when problems arise.
One day he was dragged down into a dive to the heart , and experance many visions and dreams of the outside world. He told it to his friends but they did not belive him.

With no one to turn to Kazuma begins to study the visions and dreams he got and meets Mickey Mouse who takes him to the Mysterious Tower where Master Yen Sid takes them both in as apprentices. Teaching them both everything he knows about magic and the keyblade.
Yen Sid then reveals to Kazuma that it was he who sent Mickey to him stating that it was the stars that told him to do so.

Kazuma then asks about the dreams and visions that he has , and that he has also been thrown from world to world after touching a Keyblade. Responding in a rather annoyed tone " This has not happened before "

" Calm down Kazuma , those visions and dreams you have are indeed true and that there are other worlds that exist along with a legend that says that all worlds share the same sky ' one sky ' and that each star is the heart of a world or person.
Stay here Kazuma and you may very well learn how to use a keyblade. "


Weeks pass...

One day , Master Yen Sid leaves his sorcerer's hat out and Mickey places it on his head , casting spells of all types. By enchanting the brooms, he has them do his chores and eventually decides to take a nap, only to awaken and find that the spell has gone horribly wrong and chaos is running rampant, with the entire tower flooded.

Despite his mistakes, Yen Sid keeps him on as his apprentice and Mickey eventually is able to wield the Star Seeker Keyblade.

Yen Sid then turns to Kazuma after working with Mickey , telling him " Calm your mind and reach deep inside your heart and summon forth your power "
" It is not working how many times must I do this ? " came Kazuma's frustrated replay.
" It is because you are not focusing "

This training went on until his 14th birthday and he summons his keyblade for the first time. The keyblade looks very different then Mickey's Star Seeker. His looks more like a sword that is black , white , yellow and blue in color that features a black and white wing on the guard , along with a sun and moon keychain token. This keyblade is the counterpart of the X-Blade.

Yin Cid appears to be pleased but keeps the secret to himself unless the time it needs to be revealed comes. Fearing that such knowledge may cause the worlds to collapse. The two sides Light and Dark , Life and Death exists in balance in a few worlds called the realm between.


During this time Ventus trains under Master Xehanort as part of the elderly Keyblade Master's plans to forge the legendary χ-blade.
However , Ventus proved to be a poor candidate, and when he refused to use his darkness to fight several Neoshadow Heartless in the Keyblade Graveyard, Master Xehanort finally lost patience with him and used his own Keyblade to unlock and extract the darkness from Ventus's heart, using it to form a being of pure darkness who was then named "Vanitas" by Master Xehanort.

Unfortunately, the process left Ventus in a comatose state, with his broken heart of pure light slowly fading out. Master Xehanort, disguised in a black coat, then took Ventus to the Destiny Islands to allow him to live out his last days peacefully. Ventus was sent to the Dive to the Heart, where he came in contact with the heart of a newborn Sora. After a brief discussion, Ventus's heart connected with Sora's, halting its deterioration and allowing Ven to stay alive until he someday becomes strong enough to repair the damage by himself. Ventus then summoned a Keyblade and shot a ray of light into the sky above, much to Master Xehanort's surprise. Xehanort decided that Ventus could still be of use in his master plan, but with Ventus still too weak in comparison to Vanitas, the two boys could not be trained under him.

Following these events, Xehanort brought Ventus to Land of Departure, where he could train as an apprentice to Master Eraqus. Terra and Aqua met Ventus with open arms. However, when Terra asked Ventus about his past, he screamed out in agony, eventually falling unconscious. Eraqus revealed that this was because Ven had lost his memories. Afterwards, he remained asleep for some time. As he slept, Aqua kept watch over him, to keep him safe. Some time later, Ven woke up. Overjoyed, Aqua quickly alerted Eraqus and a worried Terra about Ven's recovery.

It was then that his heart began to heal and he started to form strong bonds of friendship with Terra and Aqua. During a training session, Ventus loses humiliatingly, but Terra and Aqua reassure Ven that he was getting stronger. As time went on, Terra and Ven grew close, forming a brotherly bond. Terra even went so far as to give Ven his wooden training Keyblade and recite a mock Bequeathing ceremony. Together, the three of them shared the same dream: to become Keyblade Masters.


The Night before...

Ven, Terra, and Aqua watch a meteor shower together and she gives them each a good luck charm, and saves one for herself.

The next day , Aqua and Terra take the mark of mastery exam. Following the trial Aqua is made a master , while refusing to give Terra the mantle on the grounds that he is unable to control his darkness.
Despite the formality, Eraqus confides to Terra that he has the potential to become a Keyblade Master. Little does Eraqus know that Xehanort had used his dark powers to tamper with the course of the Exam itself. Soon after, he conveys to Aqua the responsibilities that go with her status and what she is required to do if he died for any reason.

With Xehanort no where to be seen, Eraqus sends Terra and Aqua to find him shortly after being contacted by Master Yen Sid about the spawning of the mysterious Unversed. Sensing a possible connection between the two events, Eraqus later instructs Aqua to look after Terra, as he fears his apprentice may be tempted by the darkness. However, after Terra departs, Aqua and Eraqus witness Ventus leaving as well, and he instructs Aqua to bring Ventus back.


During this time Kazuma and Mickey undergoes the Mark of Mastery Exam under the supervision of Yen Sid at the Mysterious Tower , accompanied by Donald and Goofy , during which he uses the Star Seeker Keyblade and eventually runs away without Yen Sid´s permission, using a Star Shard that allows him to travel throughout other worlds; however, it works rather randomly, as he has not learned how to control it.

With Mickey gone Kazuma is told to find him and bring him back , and thus his story begins...