Not really different worlds i guess.. wel, maybe, but it's the worlds of gods and humans as well as the time from 2000+ years ago
When you can't even trust your own memory, who can you trust?
The memory that Jesse remembers and the memories that are told to him are like different worlds.
The world which Natsume sees and the world that humans see
The world that she remembers from her past and the world she was reborn in
Different dimensions. It gets confusing, bit it's whimsical
There's a shinigami world and the world where humans are.
Athena Complex