Though I Am an Inept Villainess: Tale of the Butterfly-Rat Body Swap in the Maiden Court, Volume 4 (Though I Am an Inept Villainess: Tale of the Butterfly-Rat Body Swap in the Maiden Court #16-20)

No longer separated by social duties or even magicked candlelight, Keigetsu and Reirin at last come face-to-face on the grounds of the ornate Kou Palace. The two Maidens have been unwitting puppets, and the Noble Shu's long-planned plot is rapidly unfolding. The inept duo go forward to tackle Shu together, their clasped hands poised to rend the powerful curse asunder. Will their efforts save the declining Empress? What awaits after challenging the curse's crafty maker?