In the year 220X, humanity has advanced to radio‑wave technology, linking the world through the Wave Road. Subaru Hoshikawa, a fifth‑grade student whose father died in a space accident, encounters an extraterrestrial radio‑wave being named War‑Rock, who arrives from a distant FM planet. War‑Rock claims to know about Subaru’s father, but several alien beings are after him. Together they merge into Rockman, a radio‑wave human capable of traversing the Wave Road and battling the radio‑wave viruses and FM threats that endanger Earth.