Intai shita Ossan Boukensha, Saikoyou de Saikyou Guild Master ni Natteshimau

Donovan is a middle-aged member of the guild "Silver Moon Fox," a veteran adventurer who gets by doing nothing but the easiest quests. Unable to look past his lackluster attitude, the guild's top-tier members suggest he retire—and to their surprise, he readily agrees to walk away.

――However, the Guild Master, Egerton, appears before him with a startling proposal: "How would you like to become the Master of this guild?"

Soon, the truth of Donovan's hidden strength and his deep-seated connection to the legendary and feared "Black Demonic Dragon" begins to surface. When an old-timer finally gets serious, he’s a force to be reckoned with.