A comet brings the end of the world, and two kids realize their only weapon is to stop fighting separately, Netto and his NetNavi have to become one thing to survive it. The show strips away the collection-game comfort of earlier Rockman.EXE and forces a genuinely apocalyptic stakes question: what does it cost to fuse with your AI partner when the alternative is extinction? Cross Fusion isn't a power-up anymore. It's the only prayer you have left.
A comet streaks across the sky, and with it comes catastrophe. Massive digital viruses begin manifesting in the real world, destroying everything they touch. Netto and Enzan are forced into action, using their cross fusion ability to merge with their Navis and fight back. But the battle doesn't go as planned. A mysterious force pulls them away from everything they know, dropping them into an unfamiliar world where they finally come face to face with the entity behind the invasion: Duo, a cosmic being with plans far larger than either of them anticipated. Stranded and separated from their normal lives, Netto and Enzan must figure out what Duo truly wants and why it's decided to target Earth. The conflict expands beyond simple virus elimination into something more philosophical, questioning whether coexistence between the digital and physical worlds is even possible. High-stakes mecha action mixes with genuine character growth as the boys discover that stopping a cosmic threat requires more than just powerful attacks. Allies emerge in unexpected places, and the line between enemy and savior blurs as the real stakes of this war become clear.