In the year 220X, the world has advanced toward radio-wave technology, and the globe is linked by the Wave Road. Subaru Hoshikawa, a fifth-grade student who lost his father in a space accident, encounters War-Rock, an extraterrestrial radio-wave entity descending from a distant FM planet. War-Rock claims to possess knowledge about Subaru's father, but numerous alien beings are pursuing him. The pair collaborate and merge into Rockman, a radio-wave human capable of navigating the Wave Road and fighting the radio-wave viruses and FMs that threaten Earth.