In a world where dungeons appeared and humanity gained magical powers, innate magical capacity became the measure of strength. Tenchi Hai, the weakest dungeon challenger with meager magical power, was tackling dungeons to earn money for his bedridden sister Nagi’s medical treatment. However, Nagi’s condition suddenly worsened, urgently requiring a vast sum for treatment—!? In desperation, Hai recklessly joined an investigation of an unknown dungeon with a hefty reward, but…
