Ester, a young lady from the De Morax ducal family, is fifteen years old and has a complex about not being able to wield light magic as powerfully as her mother or brother.

One day, Ester left her domain for the first time and arrived at the royal palace. According to Prime Minister Waldonez, who had summoned her, a spy named 'Tenebrae' from the neighboring country Nyxaburg is attempting to ensnare Lady Amanda Pretzki, the ducal daughter who is engaged to First Prince Ivlis. And for that purpose, they wish to enlist Ester's aid...?

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※This is a sequel to "I was told my engagement was broken off because of me, and I was fired from the castle." (https://ncode.syosetu.com/n7719hu/). Both works are slated for publication by Kadokawa Beans Bunko.