The End

In the setting, there were two kinds of timelines.

One was a large timeline that ran through all plane universes; for now, we would call it A.

The timeline running through all plane universes also possessed infinitely many parallel timelines, which we designated A1, A2... An.

The second referred to the timeline within a single plane universe. It was a small timeline, which we would temporarily call a.

Take Battle Through the Heavens as an example.

The original work belonged to a universe traversed by the A1 timeline.

In its parallel universes, perhaps Xiao Yan was stronger, or perhaps Xiao Yan was weaker. Those universes would then be traversed by the large timelines A2 or An.

At this point, the original work was on the A1a1 timeline.

Suddenly, an unknown intruder entered this timeline.

Then this timeline would change into A2a1.

Now, let's talk about this book's protagonist.

It was unknown whether she existed in the primary spacetime or a parallel universe.

So, we placed her on the A9 timeline.

On this timeline, there was only one protagonist.

She was now on the A9a1 timeline. This morning, something made her leave the house.

However, the version of her from before in a parallel universe had chosen to go out.

At this moment, if she chose to go out, it continued. If she chose not to go out, it became another timeline.

At that point, the timeline would branch and become A9a2.

Afterward, the protagonists in other parallel universes began making choices. Once she chose not to go out—

What happened on this timeline would become A10a2.

Of course, once they made different choices again, the number after the small a would continue to change.

Endlessly.

When Kurumi first arrived in the Mo Hei Universe,

she discovered Zadkiel, which meant that