The four sisters of Room 301 girls' dormitory met their deaths in a zombie wave, only to be collectively reborn ten days before the doomsday. Awakening a shared space, they frantically stockpiled supplies to build a secure fortress. When the apocalypse descended, the four fought side by side through bloody carnage, accidentally traveling back to an ancient land ten thousand years ago. Hand in hand, they led primitive tribes in building infrastructure, promoting agriculture, and spreading civilization, blooming with the power of growth through wisdom and courage in two desperate situations.