A bullied kid gets handed absolute power and immediately becomes exactly the kind of person his tormentors were, just with a giant robot. Linebarrel doesn't flinch away from what that actually costs, watching Kouichi stumble through godhood while the people around him pay for his arrogance is the real plot. The mecha battles matter less than the question the show keeps asking: does having the power to save everyone actually make you a hero, or just give you a better excuse to be selfish?
Kouichi has spent his entire school life getting pushed around. A social nobody with dreams of greatness, he spends his days fantasizing about being a hero while his classmates walk all over him. That changes the moment a mysterious girl and an enormous robot called Linebarrel crash into his world. Suddenly Kouichi has the power to pilot one of the most advanced machines on the planet, and with that power comes responsibility he never asked for. What starts as the chance to finally matter spirals into something far more complicated. Kouichi finds himself caught between multiple factions with their own agendas, each wanting to use him and Linebarrel for their purposes. As he's pulled deeper into a world of political intrigue and mechanical warfare, he discovers that real heroism looks nothing like the fantasy he created. Piloting a giant robot doesn't make him special or untouchable. Instead it forces him to grow up faster than any teenager should, confronting what it actually means to protect people and make choices that matter.