Ms. Mari takes Lan and Maylu to an International Exhibition being held at the amazing new Sea Tower building that rises up from the middle of the harbor, but their visit is interruped when ever-ready Net rival Tamako appears and goads Lan into a NetBattle. But soon there's another interruption: SavageMan shows up, sent by the Mysterious Man to take care of MegaMan and Lan in exchange for the DarkChips he craves. The forces of evil aren't messing around this time: they've even sent in Ms. Yuri to destroy the Sea Tower with our heroes inside!