This world is created by Memories.
By living, people become Memories of the planet, which is how this world takes form. Even now if there are memories from the everlasting remote past, those are Memories of this moment as well. And when Memories are lost, their existence is also erased. That is what people call Lost.
Things that are Lost originally could not be restored by the power of humans. This way of things was supposed to stay the same throughout the generations. However, a young man who uses the power of Memories appears in the world. That young mans name is Kanata. Whether he will bring hope or new despair to the world is something that remains to be seen.
But there is no mistake that Kanatas journey surrounding Memories that is now beginning will have an impact on the world.