Middle schooler Hikaru Amatsuga lives in a society where ancient aliens have merged with humans to create Mecha-ude. After becoming paired with the rare and powerful Arma, Hikaru joins the resistance force ARMS to protect his new partner from dangerous pursuers. He must evade Aki Murasame, a dual-wielding fighter hunting for a mysterious Snake-Type foe, while also guarding the Trigger Arm. This ancient artifact is currently being hunted by the Kagami Group, who intend to use its immense power…
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