Gail Hamilton is a curse crafter, an artisan who creates items imbued with curses. After his party achieves the prestigious S-rank, they expel him, believing he has not been contributing enough to the group's success. What his former teammates failed to realize is that Gail's cursed goods possess power rivaling holy relics and legendary artifacts. Undeterred by the dismissal, Gail decides to operate independently, and his strange yet remarkably useful cursed items quickly attract attention throughout the guild.

The story is set in a fantasy world where adventurers form parties and are ranked by a central guild, with S-rank representing the highest level of achievement. Gail Hamilton, the protagonist, possesses a specialized and often misunderstood craft. His former party members are an unnamed group of adventurers who dismiss his contributions and are unaware of the true value of his abilities. Additional characters appear as Gail begins his solo journey, encountering guild officials and other adventurers who react to his unusual creations with a mix of suspicion and fascination.

The initial narrative arc focuses on Gail’s expulsion and his immediate struggle to establish himself as a solo curse crafter. This leads into a second arc where he builds a reputation, and the power of his cursed items becomes widely recognized, causing a sensation within the guild. A subsequent arc explores the consequences of his former S-rank party learning the true worth of the items they discarded. The ongoing story follows Gail as he continues to thrive on his own terms, proving that a curse crafter is far more valuable than anyone in the S-rank party ever imagined.