Koyou's first visit to the Moon Flower Kingdom capital hasn't exactly been the relaxing trip she expected. Between chasing down pickpockets, running into the enigmatic Stem Sect, and treating a serious case of pneumonia, she can't seem to catch a break! And though she was lured to the capital by her mysterious patron Crown Prince Keiun's promise of a smorgasbord of muscles large enough to satisfy her medical curiosity, it soon becomes clear that she's been unknowingly embroiled in a plot disguised as a vacation. Keiun is desperate to usher in a medical revolution and is betting his life and reputation on Koyou's unorthodox skills. But will they be enough to win over the ruling powers in the treacherous royal court?