So, whatever happens in this past has already happened in her present. But MC doesn't know about it. So by figuring out what happened, she has a chance to solve the issue in her present.
Wonder how she'll solve said issues, especially something like holding the entire curse that keeps the Demon Lord weak.
Y'know, through the power of Yuri, they're probably gonna turn the Demon Lord good even after releasing the curse and giving her back her full power, aren't they?
Thanks for the TL