It will be published by Earth Star Novel under the title 『Strategy for "Starting a Business" in the Hidden Dungeon of My Backyard and Achieving an Annual Income of 12 Billion Yen』. The illustrations were created by the rare genius, Mr. ttl.

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Ten years ago, after a meteorite's close approach, a dungeon suddenly appeared, as if "sprung from nowhere." The magic crystals mined there completely transformed the world's energy situation.

Electricity bills plummeted, and with no CO2 emissions, it was eco-friendly.

Those who mined magic crystals were dubbed "Miners," and with high-purity magic crystals fetching exorbitant prices, dungeons swarmed with Miners dreaming of striking it rich. Some even awakened to "supernatural abilities," but as these could only be used within dungeons, the world remained peaceful and grew prosperous.

Indeed, ten years had passed since then.

"What an incredible world, huh..."

Quietly nestled in the backyard of the old, unused house I'd bought was a dungeon.

"How much would all of this be worth if I sold it...?"

What lay there was a mountain of untouched, high-purity magic crystals.

This is the story of how I quietly and discreetly sold off the magic crystals from my "Backyard Dungeon" without anyone ever finding out.

My goal: an annual income of 12 billion yen.

Thanks to that ridiculous, yet utterly desperate goal—I was able to pull myself back from rock bottom.