Hmm... From the future?

From the past?

Or maybe you mean another world? This is you talking, after all.

You believe in parallel worlds too, Renko?

...Oh. I'm glad you said that.

Well, y'know... Parallel worlds are part of us physicists' field to begin with, right?

Only as a thought experiment, of course.

It's nothing more than philosophy, but...

And then there's the "many-worlds interpretation". It means that every single choice splits the world into several paths.

First of all, there's the "brane cosmology" I mentioned before... countless film-like worlds stacked on top of each other.

So thin you couldn't see them, right?

Yeah... so-called alternative worlds. When it comes to parallel worlds, I feel like those are the most mainstream idea, but they too are in the realm of physics.