Fourteen-year-old Kouichi Hayase lives an ordinary life until a mysterious accident changes everything. After encountering a strange girl and a massive robot called LINEBARREL, he is thrust into a series of intense battles. As he learns to control his newfound abilities, Kouichi must form new alliances to survive. The conflict forces him to face the heavy consequences of power, learning difficult lessons about loss and friendship while struggling against the complex plots unfolding around him.
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