One hundred and thirteen thousand five hundred years ago.
In a certain world.
A primitive man wearing a bark skirt sat by the lake, tying a small insect to the end of a vine and throwing it into the water.
He waited patiently for the fish to take the bait.
Suddenly.
Another primitive man appeared behind him.
"What are you doing?"
The other primitive man asked with interest.
The communication among the primitive people was originally limited to words like "ah, eh, ha, wah, huh," supplemented by tone and body language, to make themselves understood by others.
But.
Without any barriers, the fishing primitive man directly understood his expression.
"Ah ah—eh—ah wah ha—"
The primitive man put down the fishing rod and began to express himself through dancing and gesturing with his hands and feet.
The inquiring primitive man listened and watched, gradually understanding what he meant.
"You're saying—"
