@skytempest I feel this is like a mix of Bakarina + Duke's Daughter + Lady Rose Wants to be a Commoner. Duke's Daughter as the story opens at the point game's ruinous ending. Bakarina because unlike Duke's Daughter for she reincarnates as a kid with a pretty upbeat tone. Lady Rose Wants to be a Commoner because it's post-game down the bad ending for the "villain".
Though I don't agree it resembles "I Swear I Won't Bother You Again". I mean yeah, she plans on becoming a nun, but this character is a nun. Meanwhile that MC has been thrown back to the start of her "game" and exploring how will change that fate.
Though I find it pretty interesting that given the "divergence" point is so early, but apparently was not able to change her fate at all.
@Ruruskadoo - Psst... another one for your list.