Amou Shiba is a 16-year-old orphaned mechanic in an occupied future Japan. After losing his family during the Boundary Wars, he discovers an abandoned AMAIM workshop, where he bonds with an autonomous AI named Gai and reforges a skeletal humanoid weapon frame into the combat-ready mecha Kenbu. Shy and curious by nature, he harbors a layered personality—warm and open to exploration, yet capable of icy resolve and calculated ruthlessness under pressure. His early attire consists of a yellow shirt with blue stripes and three curled pigtails, later transitioning to a black t-shirt layered over red fabric while his signature hairstyle persists. Driven to free Japan from foreign control, he allies with the resistance group Yatagarasu. The death of a close comrade temporarily breaks his resolve, driving him into self-imposed exile and emotional numbness. A defining clash against a powerful foe culminates in a self-sacrificial explosion that he survives, but at a corrosive psychological cost. Emerging hollowed and haunted, he recoils from former allies, tormented by memories of a caretaker’s violent end and the terror-stricken faces of bystanders during his own retaliatory strikes. Recovery comes through incremental reconciliation with his trauma, steeling him to rejoin the resistance with tempered determination. The Kenbu evolves alongside him, gaining upgrades such as a heat sword, rifle, and claw shield, and he learns to strategically deploy its full potential—including removing limiters for heightened combat efficiency. After the conflict, he departs structured rebellion and wanders the borderlands alongside a rebooted Gai, embodying a quiet dedication to reconstruction and peace. His bonds with fellow resistance fighters linger as complex tapestries of shared loss and tactical symbiosis, with subtle emotional undercurrents shaping his fractured yet persistent humanity.