Though I Am an Inept Villainess Season 1 Episode 1

Just as His Highness’s favored butterfly Reirin is beloved by the prince, jealous “court sewer rat” Keigetsu uses magic to swap their bodies—and their destinies. With a looming execution, Reirin embraces her new, healthy body, while Keigetsu learns Reirin’s life isn’t what it seems as she’s pulled into an inner-court conspiracy.