Boukyaku Seijo summary:

Rescued from a slum, Mariabelle was raised in the temple as the thirteenth in a line of saints. But one day, she awakened to find that she had been completely forgotten by those around her. Abandoned by the head priest who acted as her foster father, and banished from the temple, Mariabelle felt she had lost everything... But then she reunites with Ehre, the sole priest who still remembers her! With his assistance, she enlists herself in the "Selection Ceremony," aiming to reclaim her position as a saint! Thus begins the tale of her taking back her happiness!