Two weeks ago, the "dead who should have stayed dead" rose from their graves.

They attacked the living and bit them.

Those bitten died instantly, and in many cases, transformed into new perpetrators as rotting corpses minutes later. (In cases of a shallow bite, they may last for several days in an incubation state).

...

The infection spread explosively, and daily life as we knew it crumbled without a sound.

Family, friends, even the teachers who were always kind

—everyone became the enemy.

... From outside the window, the sound of strange footsteps crawling down the hallway and the eerie noise of flesh being torn and chewed can be heard.

Beyond the desks and chairs piled up as a barricade, stained with dark blood, the remnants of former classmates wander.

... —The only ones left alive in this school are

Guest and their best friend, Minato.