English version title - Bubble Trouble Netto and Meiru visit the water treatment plant for a school field trip, only for it to get attacked by a hacker! The hacker attempts to control the water in the pipes and flood the city, so Netto uses his new Net Savior authority to investigate the situation. He finds out the navi behind the mess is Bubbleman... but Netto and Rockman's recent arguments soon reveals that Cross Fusion won't work unless the net-op and his navi are in perfect harmony.