People of the past and future watch both lives of lady Heaven Potter-Black/ Seraphina amethyst Slytherin.

Our main character has reincarnated...but with a catch? Instead of any of the tropes she could have reincarnate as, she reincarnated as both the villainess and heroine!? Despite having only a single consciousness, she is aware and in control of both bodies! Controlling two bodies with completely opposite roles as only a single individual, how will our dear protagonist handle a world designed to both adore her as the heroine and hate her as the villainess at the same time?