In a world where people are granted skills from the heavens upon turning 15, I—Hiraku Matou—was born into a prestigious family of sword saints. Called a prodigy since childhood, everyone expected me to become a sword saint too. But during the sacred Skill Appraisal Ceremony, the only skill I received was [Open]—a seemingly useless ability that merely "opens closed things." Disappointed, my family cast me out. Lost and abandoned, I soon discover the true power of my skill. With the ability to open the "Status Window," I gain access to skills and dropped items at will, becoming overwhelmingly powerful! A cheat-skill fantasy in another world where the underdog turns unbeatable!