Alucarda, la hija de las tinieblas

When the teenage orphan Justine arrives in a convent, she befriends Alucarda, who was raised since she was a baby by the nuns. They become best friends and stay together most of the time. When they meet a gypsy on the forest, he is indeed Satan and possesses the teenagers. Soon the convent is turned upside-down affecting the lives of Alucarda, Justine, the nuns and Father Lázaro. The skeptic Dr. Oszek will also witness a showdown between good and evil affecting his beliefs. - IMDb