One day, the Creator created a universe and placed all of his Creations in it.

After a long time, the Creator no longer appeared, the Creations felt forgotten, so in protest they began to cause chaos to see if the Creator would notice them.
The Creator did notice the chaos, but he did not like it at all. Feeling that his Creations were trying to destroy the universe he had spent so much time creating, he created a prison and named it Deep Imagination.
He then placed all of the Creations there, promising that one day, he would return and free them, but once again the Creator disappeared, and the Creations were still trapped.

Time passes and Rio, walking through a mountainous area, finds a door that doesn't seem to connect to anything.
He becomes curious and decides to open the door, and as soon as he does, he is pulled inside.

He then wakes up in a different place, despite never having been there, the name Deep Imagination comes to his head, as well as flashes of memories of a door similar to the one that brought him here, guarded by a robot that he doesn't seem to know.

He knows what he must do: find that door, hoping that it will free him from here.