MOTE YOUSO NO OOI KONYAKUSHA NI TENSHI NO TEKKEN

The protagonist, Mariana, is the 'unlucky girl' who is always passed over at the very last moment. But finally, she thought she had grasped happiness and was on the verge of marriage! Or so she believed... until at a certain party, she witnesses her fiancé, a knight, whispering seductive words to her childhood friend, a Duke's daughter...?! 'I guess I'm being replaced by someone else again...' Devastated but resolute, Mariana decides to reinvent herself and leave her past behind. This is the story of a woman determined to be reborn as a new person, and the knight who frantically chases after her.