Though I Am an Inept Villainess: Tale of the Butterfly-Rat Body Swap in the Maiden Court Novel Volume 9 was written by Satsuki Nakamura with illustrations by Kana Yuki.

After staving off sabotage during the Congee Conferment Rite, Kou Reirin and Shu Keigetsu have successfully turned the tables on the emperor's assassin. Their former adversary—now accomplice—sheds some light on Emperor Genyou's past, giving our heroes the context they need to plot their counterattack! It all comes down to the body-swapping spell and a fateful confrontation from twenty-five years ago. Reirin won't rest until the ultimate sovereign gives Keigetsu and her forbidden magic his blessing!