S1, E1: Mikey Kudo is a good-natured boy who can't resist helping people in trouble. One day, a strange melody and a mysterious voice reach his ears. Mikey tries to encourage the frail voice that says it's about to be deleted. In front of him, there suddenly appears a Fusion Loader shining with red light. Mikey picks it up without thinking and he's pulled along with Angie and Jeremy into another world.