Kingdom Hearts 0.2: Birth by Sleep – A Fragmentary Passage is a new game told from the perspective of the protagonist Aqua. The story begins after Kingdom Hearts: Dream Drop Distance when King Mickey reveals that he has secrets to confess relating to Aqua and her time in the Realm of Darkness. The story then picks up right after the secret ending of Kingdom Hearts: Birth by Sleep Final Mix and details Aqua's journey through the Realm of Darkness during the following ten years. Fragments of worlds previously found in Birth by Sleep make up the game's environments.