I Lived an Honest Life Only to Have My Fiancé Betray Me, So in My New Life I'll Live as the Villainess Volume 3

Mianna is forced to quit the academy for an arranged marriage. However, as she spends time with her fiancé-to-be, she can't stop thinking about Elliot. Realizing at last how she truly feels, Mianna breaks off the engagement and hurries back to the academy... only to find that the one waiting for her there is none other than her younger sister Natalie, who claims to have been chosen as Elliott's fiancée! Amidst these obstacles, the clock continues to tick towards Mianna's 17th birthday and the end of the world yet again, but will her rekindled belief in love be enough to change her fate?