Haruhiko Ito, a company employee, is fed up with his busy work life and decides to quit and become a "seeker" who makes a living by exploring dungeons.
In the beginning, he uses several skill orbs to acquire special abilities, but he keeps getting nothing.
The last orb was also a failure... but what he got was the most powerful skill, "sorcery," which allows him to acquire a huge amount of magical knowledge!
An ex-employee seeker becomes a savior with the strongest skill!