Realities

Our "reality" isn't really reality. We are raised to be pulled into their world for whatever purpose they have for us.

When we dream we're drifting into reality.
Dreams are a glimpse of reality
We generally forget our time there, but sometimes we can recall fractions of our stay.

They study us and pick who they believe who could help them the most.
When completely pulled into you're unconscious in this world until A: someone sends you back B: someone wakes you up on this side C: If you die your dead in both realms.

This is the story of Anchihiro, he belongs in the drift, but when a human gets caught in the middle he ends up stuck with him.