Synopsis
Dungeons appeared across Japan one day, and those with talent rushed to become Explorers. Natsume Koichi had no remarkable talent — his aptitude tests said so, and corporate life ground him down before finally spitting him out. Unemployed, he returned home, wandered to the mountain secret base from his childhood, and found a dungeon gate. The authorities certified it as empty space. They were wrong. What followed was a very quiet, very private climb from the bottom.
