Rockman Dash: Hagane no Boukenshin

Mega Man Volnutt retrieves a large blue refractor from an ocean tower ruin, then heads back to his airship, the Flutter. Engine trouble forces a crash-landing on Kattelox Island. While he, Roll, and Barrel search for repair parts, the Bonne family — a pirate crew with giant mechanical weapons — descends on Kattelox City in pursuit of the island's legendary buried treasure. Mega Man pushes back against Tron Bonne and Bon Bonne's attacks and defeats family patriarch Teisel at the Clozer Woods ruins. Mayor Amelia explains that local legends describe the treasure as capable of triggering a great disaster if uncovered, and asks Mega Man to investigate why Reaverbot activity in the island's ruins has been increasing.