Humanity, on the brink of collapse after a devastating zombie outbreak, has retreated to its last refuge—a camp hidden within Yellowstone National Park. Supplies are scarce and hope is fading fast. That is, until an unexpected savior arrives: a herd of unicorns.

Though the situation has been stabilized, the war against the undead is far from over. Determined to prove herself, Sergeant Glitter volunteers for a mission to find food but instead stumbles upon Kate, a lone survivor who may hold the secret to ending the conflict once and for all.

Along the way, Glitter and Kate will cross paths with a group of sirens and their cute boyfriends, a secretive cult, a hidden community of bigfoot, and a royal lineage of winged pegasi who may hold the key to their survival. As they navigate these strange alliances and treacherous foes, they begin to unravel a truth even more shocking than the undead.