Chuunen Majutsushi no Yuuyuujiteki na Dungeon Kouryaku: Skill Orb o Tsukattara Saikyou Skill o Te ni Ireta node, Suki ni Ikiyou to Omoimasu @COMIC

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!