Adele von Moyu, the former legitimate daughter of a famous magic family, was forced to live in a slum with her useless stepfather and middle school stepbrother because her family was involved in the "Magic Illegal Fund-raising Case" and went bankrupt. In an era when traditional magic is being impacted by the rune industry, her only chance to make a comeback is to become a "Royal Arcanist of the Great Yan Empire" - an "iron rice bowl" with five insurances, one housing fund, paid annual leave and lifetime immunity.
However, during a dark cooking experiment that attempted to analyze the "Three-Year Examination and Five-Year Simulation", she accidentally exchanged her soul with Lancelot, the sickly and vicious mercenary king who came to violently collect debts.
As a result, Adele, the strongest "examination machine" in the continent, was forced to use the body of a yandere male god to carry goods in the underground arena; while the elegant mercenary king had to carry the skin of a young girl to study "Run Logic Analysis". On the way to the exams, the two hurt each other. Not only did they have to deal with the empire's written examinations, but they also had to work together to uncover the truth about the worldview behind the "industrialization of magic."
