ข้อมูลอนิเมะLinebarrels of Iron

Kouichi Hayase is a high school student who is often bullied at school, but dreams of one day becoming a hero. After being bullied into buying stuff for his schoolmates, he decides to take a shortcut through a forest, which is when a giant object falls on him. After regaining consciousness, he sees a giant robot in front him and a naked girl lying beside him. He covers her with his jacket, and after waking, she is revealed to have partial amnesia and goes with him to his house. Soon after, other giant robots begins to attack the town. The girl tells Kouichi that they are enemies, and goes into town with the intent of fighting them. Following her, Kouichi encounters his friend, Hideaki Yajima, who plans to use himself as bait in order for the two to get away. After Kouichi reveals his frustration in not being able to do anything, the girl reveals her name, Emi Kizaki, and has him summon a giant robot, known as a Machina called Linebarrel. Though he defeats the enemies with his newfound power, he is shocked when Emi tells him that he is dead.

At an unknown location, the Katou Organization, which belongs to an organization bent on capturing the Machina Linebarrel, and JUDA, which is publicly known for being the world's largest medical equipment maker, are engaged in a heated battle. With JUDA's forces being overpowered, they ask for reinforcements, which comes in the form of another Machina called Vardant and its pilot, Reiji Moritsugu. As he handles the enemy, the other members of JUDA are discussing the recent actions of their enemy, the Katou Organization. Meanwhile, Kouichi's family welcomes Emi into their household, and Kouichi shows his newfound abilities and confidence at school by beating those who bullied him. Later, Kouichi expresses his gratitude to Emi for having killed him, giving him a new life, after which the Katou Organization begins a new attack to lure out the Linebarrel. Kouichi is thrown into battle once again, and two of JUDA's Machinas are also in the fray in an effort to stop the enemy as well. Kouichi, however, declares that he is the only real "justice", and goes on to fight both sides, not realizing the collateral damage he is causing. After the Machinas retreat and Kouichi declares his job done, Emi and Yajima are stunned to see his actions and the damage he has caused.

Kouichi has caused massive damage to the town during his battle on Linebarrel fighting the secret Katou Organization. Kizaki feels guilty for getting the citizens entangled in the battle, but Kouichi himself has no such notion, truly believing that he is the hero of justice. Then, Vardant, controlled by JUDA’s ace pilot Reiji Moritsugu, appears before Kouichi.

Having lost Linebarrel, Kouichi gives in to despair and violently takes his anger out on innocent civilians. Since he is a factor, no one can match his physical power unarmed. On behalf of Risako Niiyama who is worried about Kouichi, Yajima decides to confront Kouichi. In the pouring rain, Yajima and Kouichi engage in a fistfight, when a Hagure Machina appears before them.

Kouichi loses consciousness due to Linebarrel going out of control, and is taken into custody by JUDA. Ishigami tells Kouichi about the Machinas, and the Katou Organization as their enemy. Kouichi is persuaded by Ishigami to fight together as a hero of justice, but cannot make up his mind. Meanwhile, Shizuna and Izuna Endo, twin members of JUDA’s Special Task Force, were being attacked by the Armas of the Katou Organization and now have their backs against the wall.

Kouichi becomes a member of JUDA, and starts his duties while commuting to school from JUDA quarters. He is overwhelmed by the JUDA facilities, which include employees' housing and shopping malls. The members of the Special Task Force decide to throw a welcome party for Kouichi, who gradually comes to understand his true mission as an ally of justice.

Domyouji, one of Kouichi's classmates, starts acting over-familiar toward Kizaki. Sensing Kizaki's discomfort, Kouichi challenges Domyouji to a fight, but oddly enough, cannot even touch him. Later on, Kouichi is visited by Hisataka Katou, president of the Katou Organization, who attempts to offer him a position in the Katou Organization. It is revealed that both Kizaki and Katou are from a different dimension. Meanwhile, Risako confronts Kizaki concerning her relationship with Kouichi.

Kouichi, Moritsugu, and Miu are given a mission to assist the retreat of a U.S. Force transportation aircraft and to exterminate the enemy there. It is the first official assignment for Kouichi. Kouichi and Moritsugu team up and take on Masaki Sugawara and Yurianne Faithful of the Katou Organization, who are leading a vast troop of Armas. Meanwhile, Miu, who is backing up the retreat of general troops on Painkiller, is attacked by a new enemy Machina.

In order to investigate the mysterious “Spheres” deposited in various locations around the world by the Katou Organization, members of the JUDA task force, including Kouichi, head to an ARMA production base located in South America. Distracted by guilt for not being able to recognize Moritsugu’s physical disorder, Satoru Yamashita makes a blunder during the operation and ends up putting Moritsugu in danger. Yamashita becomes panic-stricken, loses control, and starts taking matters into his own hands.