"Drunken D-Rank Pulls Out the Legendary Sword" centers on a low-ranking adventurer named Rudo, whose life takes an unexpected turn after a night of heavy drinking. Known for his lack of ambition and mediocre skills, Rudo is often dismissed by his peers as a failure. However, during a drunken escapade, he stumbles upon a legendary sword embedded in a stone. Despite his inebriated state, Rudo effortlessly pulls the sword free, an act that only the chosen hero is said to accomplish. This event thrusts him into a position of unexpected importance, as the sword is tied to an ancient prophecy foretelling the rise of a hero who will save the world from impending doom.

The narrative explores Rudo's reluctant journey as he grapples with his newfound status. Though he lacks the traditional qualities of a hero—such as bravery, strength, or a sense of duty—his unorthodox methods and unpredictable behavior often lead to surprising successes. Along the way, Rudo forms alliances with a diverse group of companions, including skilled warriors, cunning mages, and enigmatic figures, each with their own motivations and backstories. These characters provide both support and conflict, as Rudo's carefree attitude and refusal to conform to expectations frequently clash with their more serious or goal-oriented approaches.

The world-building incorporates classic fantasy elements, such as kingdoms on the brink of war, ancient magical artifacts, and looming threats from dark forces. The story balances moments of humor, particularly through Rudo's antics and his interactions with others, with darker undertones as the true scale of the prophecy and the dangers it entails become clearer. As Rudo is drawn deeper into the conflict, he must confront not only external enemies but also his own insecurities and doubts about his worthiness as the chosen hero.

The manga's pacing alternates between episodic adventures and overarching plot progression, allowing for character development and exploration of the world's lore. Themes of self-discovery, the burden of destiny, and the value of unconventional strengths are woven throughout the narrative. Rudo's journey challenges traditional hero tropes, presenting a protagonist who defies expectations while gradually growing into his role, albeit in his own unique way. The series maintains a balance of action, humor, and emotional depth, making it an engaging read for fans of fantasy and character-driven stories.