Manga by author Kwak Nana

Airi, a 10-year experienced professional.Although she awakened her mana, her pitiful talent led her to go into debt for 3 years to learn magic, only to master hand-washing techniques.In the end, her family collapsed, and she fell to the status of a maid.As a maid, Airi was locked in the duke's underground library due to the pranks of the young master.There, she found a sandwich appearing daily, a strange magic circle, and only books.Thus, she was forcibly confined to the Academy of Magic Theories"When I get out, I'll sue that kid No, just let me out."