I Became the Tyrant of a Defense Game

After the Outer Gods chose this world as the stage for their Apocalypse Calamity.

They forcibly widened the boundary between life and death, this world and the afterlife, and created a new space in that gap.

That artificial space is this place, the spirit realm.

And the Outer Gods began to interfere with our world through the spirit realm.

They planted the trees of the races they chose — guardian trees — allowing those races to use magic, and thus began to spread their influence throughout the entire world.

“The spirit realm is the channel through which Outer Gods interfere with this world. In other words…”

I explained, looking around.

“If we ‘close’ the spirit realm, the Outer Gods will no longer be able to play with this world.”

To expel the Outer Gods, we must inevitably close this spirit realm.