Square Enix officially announces Kingdom Hearts: Birth by Sleep, a prequel to the Kingdom Hearts series, revealing new characters and gameplay mechanics.
Square Enix announces Kingdom Hearts HD 2.5 Remix, which includes an HD remaster of Kingdom Hearts: Birth by Sleep along with other titles.
An HD remastered version of Birth by Sleep is released as part of Kingdom Hearts HD 2.5 Remix for PlayStation 3, introducing enhanced graphics and new content.
The ancient Keyblade War occurs in the distant past, leading to the fragmentation of the Land of Departure and the rise of the Keyblade wielders.
Master Eraqus finds and trains three Keyblade apprentices: Terra, Aqua, and Ventus.
Ventus' heart merges partially with Vanitas, a dark being created from the darkness within Ventus's heart, establishing a link to the Master of Masters' plan.
Terra, Aqua, and Ventus compete in a Keyblade competition within the Land of Departure to prove their strength.
Terra encounters Master Xehanort, who begins to influence him by exploiting his desire for strength.
Ventus's body awakens inside Castle Oblivion, unaware of his past, leading to the formation of friendships with other characters.
Aqua battles Vanitas at the Keyblade Graveyard, struggling to protect the balance between light and darkness.
Terra falls under Master Xehanort's control, becoming his vessel and blurring the lines between friend and foe.
The trio confronts Master Xehanort in a decisive battle in the Keyblade Graveyard, culminating in Ventus' heart being freed.
After the battle, Aqua becomes trapped in the Realm of Darkness while trying to protect Ventus and Terra.
