"Highschool of the Dead" is a manga series set in a world suddenly overrun by a mysterious pandemic that turns people into aggressive, flesh-eating zombies. The story begins at Fujimi High School, where a group of students and staff find themselves trapped amidst the chaos. The protagonist, Takashi Komuro, is a resourceful and determined high school student who takes on a leadership role. Alongside him is Rei Miyamoto, a skilled kendo practitioner and Takashi's childhood friend, who harbors complex feelings for him. The group also includes Saeko Busujima, a disciplined and highly capable swordswoman; Saya Takagi, a sharp-witted and pragmatic classmate from a wealthy family; Kohta Hirano, an otaku with a surprising aptitude for firearms; and Shizuka Marikawa, the school nurse, who provides medical expertise and emotional support.

As the outbreak spreads, the group must navigate the dangers of the collapsing society, facing not only the relentless hordes of zombies but also the moral dilemmas and psychological strain of survival. They encounter other survivors, some of whom pose threats due to desperation or malicious intent. The narrative explores themes of trust, sacrifice, and the fragility of human civilization as the characters struggle to protect themselves and their loved ones.

The story progresses as the group seeks safety and attempts to uncover the origins of the outbreak. Their journey takes them through various locations, including abandoned cities, military checkpoints, and rural areas, each presenting new challenges. The manga balances intense action sequences with moments of character development, delving into the personal histories and motivations of the main cast. Relationships evolve under the pressure of their circumstances, with romantic tensions and rivalries adding layers to the interpersonal dynamics.

"Highschool of the Dead" is notable for its graphic depictions of violence and mature themes, reflecting the brutal reality of a zombie apocalypse. The series combines survival horror with elements of drama and action, creating a fast-paced and engaging narrative. The characters' resourcefulness and adaptability are central to the plot, as they confront both the undead and the darker aspects of human nature in a world where societal norms have disintegrated.