Kill the Male Lead to Become the Demoness

After killing the male protagonist, the originally innocent supporting lady transformed herself into a villainess. Just as she was about to enjoy her newfound freedom, she died a violent death and returned to the start of the game. Having carried over all the skills she acquired in her previous life, she was going to preemptively kill the male lead again. However, her new circumstances seem a bit... strange? "No, wait, who on Earth are you—?!" (Source: Bilibili, translated)