Decades have passed since mysterious dungeons began appearing all over the world. In this new era, "Dungeon Streaming"—broadcasting one's adventures inside these dungeons—has become wildly popular. Karin Yamada, a high-society-type dungeon streamer, however, is stuck at the bottom: zero viewers and only three subscribers. Feeling downhearted, she stumbles upon a notorious “prank streamer” attempting to blow up a dungeon wall for views. Little did anyone know—this troublemaker was one of the most promising new dungeon explorers… and Karin proceeds to beat him to a pulp! This unexpected display of refined violence sends her viral overnight. The world now knows her as the "Delinquent Ojou-sama"—and her elegant, over-the-top rampage begins!