Sentan Island is not safe, and the moment you realize that is the moment the show stops pretending it is. Akiyuki's transformation into Xam'd is not a power-up fantasy, it's a slow, body-horror rupture that pulls him further from his father with every use. The show understands that the real war is not between governments but between a kid trying to stay human and the thing he's becoming, one crystalline shard at a time.
Akiyuki lives a quiet life on Sentan Island, a peaceful place insulated from the raging war between two superpowers on the mainland. His routine shatters when a terrorist attack throws him into the center of a conflict he never sought. A mysterious light from the explosion embeds itself in his arm, transforming him into something no longer entirely human. The transformation grants him extraordinary abilities, but it comes with a cost: his memories begin to slip away, fragmenting like a dream upon waking. A white-haired girl appears in his life, offering cryptic guidance as Akiyuki struggles to understand what he's becoming. Around him, the war creeps closer to the island's shores, and his newfound powers make him a target for multiple factions. Caught between his fading identity and mounting pressure to fight, Akiyuki must uncover the truth behind his transformation while grappling with loss of self. The show blends intimate character moments with large-scale conflict, creating tension between personal survival and the weight of forces far beyond one teenager's control.