Koichi Furuya, a college student who had been working hard to save up his part-time job earnings, found himself with a skill that allowed for unlimited and instant magic recovery within dungeons, after losing 1 million yen. Deciding to make the most of it, Koichi aims to strike it rich by exploring dungeons, a task he had previously avoided. Through this process, he becomes so powerful with his unconventional skill that he leaves even the world's top explorers in awe.