Thanks to everyone's support, the book has been published by Hayakawa Bunko JA. The first volume was released on October 18, 2018, and the e-book version was published on October 31, 2018. The second volume was released on December 19, 2018, and the third volume on February 20, 2019. The content has been revised and expanded, including unpublished interludes. I hope you enjoy it. I've been working for a black company for years, where overtime is the norm, and the full payment of overtime is impossible. I've been working without time to question my life. One day, I reached my limit and quit. I don't regret it. At the age of twenty-something, I was still thinking about my future at home when I found a job advertisement in a bundle of flyers in my mailbox. It read, 'Dungeon Tester Wanted! 100 positions available! Full-time: 30, Part-time: 70. Age: 16-35. Dormitory and parking provided! Martial arts experience preferred! Full-time: Monthly salary of 300,000 yen + danger allowance + commission. Part-time: 3,000 yen per hour + danger allowance + commission. Working hours: Full-time: 5+ hours a day, 2 days off + holidays. Part-time: 3+ hours a day (minimum 3 days a week). Job content: Test the dungeons designed by our Demon King Army to see if they are effective against heroes! Challenge the dungeon, fight monsters, search for treasures, and break through the floors. Note: There is a risk of injury, so please prepare the necessary documents. I thought it was a prank, but when I called, it turned out to be real. A hidden fantasy in the modern world. A fresh start. We will create a dungeon that even heroes cannot conquer. I hope you will enjoy it.