Yakutatazu Seijo to Norowareta Seikishi: Omoide-zukuri de Kokuhaku shitara Kyuukon & Dekiai saremashita

Annabel is a saint with a healing ability called "sacred power." However, the sacred power suddenly decreases for some reason. Now useless, Annabel is forced to marry and stands at a precipice. To have a pleasant memory before her impending marriage, she confesses to a paladin named Lucas who happens to pass by at a flower festival. Later, although Annabel is satisfied with leaving things at that, Lucas appears, announcing his intention to marry her?! But in truth, he just wants to break his curse!

(Source: Kodansha, translated)