Kouichi Hayase is the main protagonist of the anime and manga series 'Kurogane no Linebarrels.' Initially an ordinary and timid high school student, Kouichi's life changes drastically after a mysterious accident involving the Machina, Linebarrel. Gaining superhuman abilities, he becomes the pilot of Linebarrel and is thrust into a conflict between the organization JUDA and the Katou Organization. Throughout the series, Kouichi matures from an insecure boy into a responsible hero, playing a central role in humanity’s fight for survival.