Nagisa Suzuki, a single mother who has always done her best to provide a calm and stable life for her family, finds herself in a dire situation after a zombie apocalypse. She once doubted her son's decision to build a bunker, seeing it as a waste of money, but now, in the chaos of the apocalypse, she is eternally grateful for his foresight. Though her protective, anxious nature has only deepened in the wake of the crisis, her love for her son remains her anchor.