While hunting weak monsters in a labyrinth, perennial bronze-class adventurer Rentt discovers an unexplored passageway. He excitedly begins searching it to earn wealth and renown, but he encounters a dragon, the strongest of all monsters.
Rentt rejoins the guild under an assumed name and sets out to explore the uncharted section of the labyrinth, where he encounters an enigmatic and formidable stranger.
After proving himself worthy, Rentt is given the opportunity to take the bronze-class exam. Together, he and two young adventurers must overcome the challenges that lie ahead in the Labyrinth of the New Moon.
After leading Laura and Raiz to battle against the final boss of the bronze-class exams, Rentt is confronted by Sheila, who has grown suspicious of his true identity.
Rentt learns of a powerful new technique that might be the key to reaching mithril-class, but to use it, he'll need high-quality equipment. The only problem is how to make money while lying low from the guild.
While contemplating his perilous choice to drink the vial of vampire blood, Rentt recounts the story of his past and the events that inspired him to follow his dream of becoming a mithril-class adventurer.