The outbreak of the devastating and infectious zombie virus disrupted the world and caused the collapse of society, resulting in widespread mass transformations into undead abominations. Amid the ensuing chaos and horror, Sae was separated from his younger brother, Rin, after being overwhelmed by a ravenous horde of hungry undead creatures. Now, Sae lives alone in the secluded woods, armed with a shotgun as a failsafe in the event that a zombie should intrude upon his vicinity.