Lisa Oakwood

Liza Oakwood is the former childhood best friend of Luke Ainsworth. Liza was a girl with a cheerful spirit who wanted to protect everyone in town, Luke mentions that Cecily Campbell looks and acts like her. She and Luke ventured into a cave that led to Valbanill , four years prior to the main story events, where Liza was mortally wounded by Valbanill. Before she died, she was able to recite her Death Phrase to perform a Demon Contract to save Luke and to produce the demon girl, Lisa. Luke doesn't have any memory of this and went along with the supposition by the others in town that he killed Liza to save his own life and to make the demon Lisa to be his servant.