The Snake Charmer's Revenge

After being cursed as a Demoness, I retreated. My stepsister, The Divine Maiden, grew flustered, wanting to find me. I burned her letter and laughed. In my past life, I mastered snake taming. When Serpent Plagues broke out, my stepsister found dens and predicted next. I sought the King Serpent, but it was tamed by my stepsister. Identified as the disaster's source, they burned me alive. I returned to the day the Serpent Plague first broke out.