Due to my Personal Grudge, I will Activate the Saint’s Decline Plan!

Amelia was the head of the magic department. However, just before her graduation ceremony, she was dumped by the man she was dating. When Amelia was told that the reason was because he ended up dating a saint who was in the party when purifying [Maga], Amelia became angry.
After boycotting her graduation ceremony, she returns to her parents’ home in the countryside and helps her father collect materials. And in the midst of all this, something happens that infuriates her because of the saint again, and she makes a decision. She is a saint, and saints are said to be the only ones who can purify [maga], so she is respected, and she will get away with any selfishness. That’s why Amelia wanted to make it possible for people other than saints to purify the [maga].
This is the story of Amelia, who sets into motion a plan for the decline of the saint due to a personal grudge, and a good-natured knight who gets caught up in it.