In a world overrun by a sudden zombie apocalypse, Minami Fushihara, a high school student, finds himself as the sole survivor unaffected by the outbreak. While the rest of humanity succumbs to the infection, turning into mindless zombies, Minami remains immune. His immunity grants him the ability to move freely among the undead without being attacked, allowing him to navigate the desolate world with relative ease. However, his survival is not without challenges, as he must contend with the psychological toll of isolation and the constant threat posed by other survivors who may not share his immunity.

The narrative explores Minami’s journey as he encounters various individuals who have managed to survive the apocalypse through different means. Among them is Akira Hiiragi, a former classmate who harbors a deep resentment toward Minami due to past misunderstandings. Their strained relationship adds tension to their interactions, as they are forced to rely on each other for survival. Other characters, such as the resourceful and pragmatic Rei Oohashi, provide additional dynamics to the story, highlighting the complexities of human relationships in a world where trust is scarce.

As Minami and his companions navigate the zombie-infested landscape, they uncover clues about the origins of the outbreak and the nature of his immunity. The series delves into themes of survival, morality, and the human condition, examining how individuals adapt to extreme circumstances. The plot balances moments of tension and action with introspective scenes that explore the characters’ motivations and struggles. While the zombies serve as a constant threat, the story often shifts focus to the interpersonal conflicts and alliances that arise among the survivors, emphasizing the fragility of human connections in a world on the brink of collapse.