Trolldo Okaasan ga Kowai!

Sayaka and Kaori are step-sisters with a bond that resembles that of biological siblings. Kaori's mother, feeling envious of Sayaka's apparent superiority, resorts to black magic to curse her. As the effects of the curse begin to physically alter Sayaka's appearance, Kaori attempts to intervene, seeking to halt her mother's actions and find a way to undo the curse.