A Middle-Aged Sorcerer's Leisurely Dungeon Conquest: I Got the Strongest Skill by Using a Skill Orb, so I Think I'll Live as I Please

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!