A kid whose dad vanished in space finds an alien that might have answers, but first they have to survive what's chasing it across invisible radio waves only they can see. The fusion mechanic isn't just combat; it's the only way a lonely fifth-grader gets to stop being alone for a few minutes at a time. By the time you realize this show is about grief wearing a superhero costume, you're already invested in whether Subaru ever gets his father back.
Subaru Hoshikawa carries grief like a weight. His father vanished in a space accident years ago, leaving him adrift in a world obsessed with Wave Road technology, where radio waves connect everything and everyone. Then War-Rock falls from the sky, a being of pure energy from a distant FM planet, claiming to know secrets about Subaru's missing father. But War-Rock arrives hunted. Alien entities crave the creature's power, and they'll tear through anyone in their path to claim it. Desperate and defiant, Subaru accepts War-Rock's offer. Together they merge into Rockman, a hybrid warrior who surfs the digital Wave Road and battles the alien invaders threatening to consume Earth from within the airwaves. What starts as protection becomes purpose. Each battle draws Subaru closer to understanding what happened to his father, but every victory raises darker questions about War-Rock's origins and motives. Part detective story, part action spectacle, this follows a kid learning that the answers you seek come with consequences you never anticipated.