Accompanied by Bianca and Nero, Rosso explores the Dragon Hill Ruins, rumored to be a dragon's battleground. While analyzing a map, Bianca uncovers a cryptic spade symbol and the puzzling word 'DRUMP.' Following the map's clues, they unearth a mysterious item at the spade's location, triggering an unexpected transformation in Rosso. The nature of the object, its ties to dragons, and the significance of 'DRUMP' gradually unravel as their adventure unfolds.