On Juliet Starling's eighteenth birthday, she goes to San Romero High School park to meet her boyfriend, Nick Carlyle, who is going to meet her family for the first time. Unfortunately, a zombie outbreak has occurred, which leads to Juliet fighting off hordes of Undead on her way to meet Nick. When she arrives, she discovers Nick fighting off a zombie which was trying to eat her, and so Nick is bitten in her place. Realizing he will become a zombie, Juliet decides she must decapitate him to save him.
When he comes to, Nick discovers he is somehow still alive, despite being a severed head, and so Juliet reveals to him that she is a zombie hunter.
Then meeting her zombie hunting teacher Morikawa, Morikawa tells Juliet and Nick that somebody has cracked open a portal between Earth and the Rotten World by a combination of black magic and explosives, and Morikawa sets out to find the culprit.
Juliet reunites again with Morikawa after fighting zombies intent on blowing her to oblivion, and finds the person responsible for the outbreak, an evil goth named Swan but she cannot prevent him from summoning five demons to the world, which take the form of zombies centered around themes of rock and roll.
Now Juillet and her body less boy friend must save the world from these zombie rock demon's, along with her Sisters and Dad.
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