Naoko was tortured by her sadistic peers for years just because she was eccentric and stood out from the crowd. After escaping from a mental institution that she was locked inside after being driven mad by the cruelty she endured, she's out to slaughter the ones who disfigured her and the ones who stood by and watched. Wearing a pumpkin mask like she did on the night she endured the ultimate torture during a Halloween Prom, she sows fear and terror everywhere she goes.
This manga is completely illogical, full of plot holes and over the top as all hell, yet it's extremely fun. It channels the chaotic energy of extreme 80's horror slasher movies with bad guys exploding with blood and getting chopped up left and right in the most gruesome, bizarre and oddly creative ways a person could imagine. It's also extremely satisfying to see the severely bullied protagonist get her revenge against the evil psychos that tortured and abused her. She's like Carrie, Harley Quinn and Jason Vorhees rolled into one. Even though she does some morally questionable things, it's hard not to root for her when you unravel the types of things she's been through.