Trolldo Okaasan ga Kowai!

Sayaka and Kaori are two step-sisters who are so close to each other that it is hard to believe they are not related by blood. But Kaori's mother is very jealous of Sayaka, thinking that she outshines Kaori, and so she starts to use black magic in order to curse her step-daughter.
br>As Sayaka's face starts to show signs of disfigurement, Kaori tries to stop her mother and to break the curse.