Swallow

Swallow doesn't hold back. If you like gore, monsters, and stories about revenge on bullies, this is for you!
After years of torment, Mildred, a meek high school student, is determined to seek revenge against her bullying classmates. She intends to curse them with them dark magic, punishing them for their cruelty - but in the process Mildred accidentally opens herself up to a terrifying demonic possession.
And the demon inside her is seemingly only too happy to fulfill Mildred's vengeful desires. Bodies start turning up with parts missing, eaten as though mauled by a wild animal...or perhaps something darker. Powerless, Mildred realises she is doing horrible things - and that the murders are changing her in more ways than one.
But is new-found beauty and popularity really worth her soul...?