Attention!：This work is translated by Google Translate for episode 1 to 6, and localized with INKR Studio and proofread by Japan Visualmedia Translation Academy for episode 7 and after.

After "dungeons" suddenly appear all over the world, humanity builds a new society with items and material taken from the monsters who lurk inside. Haruhiko Ito is sick of being overworked on a daily basis in his office job, and decides to become an "explorer" who makes a living exploring the dungeons.
First, he tries to obtain some kind of special power using skill orbs, but fails again and again. His last orb also seems to be a dud at first, but finally, it gives him the all-powerful "Magecraft" skill, and he gains mastery of the magic arts!
An ex-salaryman explorer with an all-powerful skill saves the world!?
An adventure manga based on the novel ranked No. 1 on the daily, weekly, and monthly genre chart of the "Shosetsuka ni Naro" website!