Konyaku Haki Shita Aite ga Mainichi Shazai ni Kimasu ga, Fukuen Nante Zettai ni Ariemasen!

Synopsis

Her fiancé, who is infatuated with the daughter who claims to be the reincarnation of a saint, tells her that he is breaking off the engagement. Duchess Sarah, exhausted by her relationship with her fiancé, accepts. Her furious parents sent her to a convent, but she was relieved to finally be able to live a quiet life. Just when she thought that peaceful days would return, her ex-fiancé appeared at the monastery and apologized to her. There is no way they will ever get back together, even if he says so now! (Source: Kodansha, translated)