After having defeated Xehanort and managed to have saved Kairi from her fate, Sora disappears into a dark abyss of Darkness. Just as it seems like it'll be an endless sleep for having abused the Power of Waking, an outsider manages to teleport the young keyblade wielder into a different world.

Log #0: I have discovered the power to travel through worlds. It is such a fascinating thing. The Cosmos is big and wonderful! I must learn more about it! Chaos Note #0: WHEN YOU STARE AT THE ABYSS, IT LOOKS BACK.

As he laid there bleeding to death at the hands of Elsa, Subaru made a final wish for power while lamenting at his own weakness before succumbing to a dark force. Return by Death was not the only gift he received. Will this new found power lead to him to Salvation, or drown him into despair as a pawn to this mysterious dark force? (Stronger/Darker Subaru)