They...altered them slightly. She believes she's royalty, from a system-wide kingdom in her reality's past. And that you, I, and the others from our world are knights or nobility from a different solar system.

[Simple enough an answer for a very, very complicated and loaded topic. He doesn't really want to discuss what he knows about Mercury and the Moon Kingdom, or Ami's reincarnated status...it's not his secret to tell.]

It's not as bad as it sounds, as she's able to live like she normally would.