The Dungeon Gallery's Terrifying Newbie

[Winner of the 2025 Novelpia Excellence Award:]
After waking in an unfamiliar cave with only twenty-four hours until the first Wave, a brand-new Dungeon Master has just one lifeline: the Dungeon Gallery.

With no idea how to run a dungeon, the protagonist registers as newbie and turns the gallery's advice, a bizarre Anomaly theme, and its deadly rules into a strategy for survival.