The adventuring party Sacred is rapidly rising in fame for its heroic exploits, led by the supremely talented swordswoman Sasha. Almost no one remembers that Sacred once had a co-leader: a young man named Hyse, who was also Sasha's childhood friend. Reduced from his already tenuous position as the party's workhorse to being labeled plain deadweight, Hyse is ultimately expelled from the group. The crushing devastation of this betrayal, combined with the shame of his own perceived weakness, becomes the catalyst for his transformation.

Driven by bitterness and a fierce determination to prove himself, Hyse delves into understanding his inherent Ability, a mysterious and unfathomable power not even he fully understands. This power is eventually recognized as Weapon Master, a rare and potent master-class talent that initially went unrecognized, leaving him unable to be properly trained. In contrast, his former friend Sasha awakened the well-known Sword Master ability, creating a growing gap between them that contributed to his expulsion. Now deeply mistrustful but more determined than ever, Hyse sets out to master his unique gift and carve his own path as an adventurer, all while haunted by the memory of the comrades who abandoned him.

The story follows Hyse's journey from a discarded outcast to a formidable S-rank adventurer. A central narrative arc is his struggle to understand and control the Weapon Master ability, a power that stands as an equal but opposite force to Sasha's Sword Master talent. The synopsis also strongly hints at a romantic undercurrent, as the plot is rooted in a childhood promise between Hyse and Sasha to form the strongest adventurer party together. As Hyse grows stronger, his path inevitably collides with Sacred's, setting the stage for a confrontation with his past and the friends who left him behind.