Earth with Dungeon: Koyuu Skill "Touka Koukan Store" wo Kushi Shite Sekai Kyuusai wo Mezashimasu

It has been a few decades or so since dungeons appeared on the earth and demons roamed around the world. However, the era of adventurers as in the stories did not come, and many towns have been abandoned, the economy is in decline, and the world is full of lawless zones that are slowly heading towar