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Ajin follows Kei Nagai, a pragmatic high school student whose life shatters after he is hit by a truck and instantly resurrects from the dead. This impossible revival reveals Kei is an "Ajin"—an immortal, evolutionary sub-species of human hunted by governments for lethal experimentation. Terrified and branded a global fugitive, Kei abandons his normal life, struggling to process his new reality. His only ally is Kaito, a loyal childhood friend who helps him flee authorities, though they soon separate to protect each other.Kei discovers that Ajin possess terrifying abilities, chiefly the power to summon invisible, violent shadow-monsters known as "Black Ghosts" or IBMs. While on the run, Kei is captured by the Ministry of Health, led by the ruthless and cynical government agent Tosaki, who uses brutal torture to understand Ajin biology. Kei endures unimaginable agony until he is dramatically rescued by Satō, a charismatic, elder Ajin extremist. Satō offers Kei refuge, but Kei soon realizes Satō’s true agenda is far more sinister.Satō views normal humans as playthings and declares war on the Japanese government, orchestrating a series of bloody, meticulously planned terrorist attacks to force society to recognize Ajin rights—or be destroyed. Unlike Satō, who embraces his monstrous nature, Kei desires a quiet, ordinary life and refuses to participate in mass slaughter. This ideological clash turns the two against each other, setting the stage for a high-stakes psychological and tactical chess match.As the conflict escalates, Satō attacks heavily fortified government facilities using coordinated Black Ghost assaults, overwhelming Japan's security forces. Kei aligns himself with Tosaki and a team of pragmatic allies, recognizing that Satō poses an existential threat to both humans and peaceful Ajin alike. Kei utilizes his sharp intellect to counter Satō’s battle-hardened military tactics, leading to violent, multi-layered confrontations across Tokyo.The climax centers on a massive siege where Kei and his allies attempt to infiltrate Satō’s stronghold and neutralize the mastermind. The battles test the limits of immortality, as Kei repeatedly dies and resurrects, learning to weaponize his own short-term memory loss and tactical ingenuity against a foe who seems entirely invincible. Through sacrifice and strategic brilliance, Kei finally manages to outwit Satō, thwarting the final phase of the terrorist campaign. In the aftermath, Kei returns to a tentative semblance of normalcy, forever changed by the brutal war he fought to protect the fragile boundary between humanity and the immortal monsters hidden among them.