This world is a die, and in the hollow part inside is the Void World.
And Hitogami is literally in the heart of this world.
I see.
That feeling of being sucked underground when I'm being transferred. It's because I'm really being pulled underground and I pass through the Void World. Though I say 'underground', even if I dig into the earth, I probably won't reach the Void World.
Now then, the continuation is a few years later, huh. It's a diary with a lot of omissions.