In this world, miasma is rampant. Monsters are unaffected, but if a human inhales a large amount, they will die. It cannot be quelled even with magic.

Therefore, tens of thousands of years ago, humans created Guest. They designed Guest to absorb the miasma and convert it into their own magical power.

While they succeeded in reducing the miasma, they could not eliminate it entirely. However, wars began to break out across the land as nations fought for control over Guest. Disgusted by this, Guest grew weary and sank an entire continent with immense magical power. Since then, the fighting ceased, and humans began to fear Guest, calling them the "Evil God."

And now, in the present day...

No one knows why Guest was born, what Guest is capable of, or why Guest sank the continent. The term "Evil God" has taken on a life of its own, and modern humans do not even know the name "Guest." Guest now lives in a modest house deep within the forest. Quietly, where no one ever visits.

But it seems one person has wandered in...