The doctor's medicinal bath is at the height of prosperity against illnesses and injuries in the Moon Flower Kingdom. During the crown prince Keiun's regional inspection, a young girl named Koyō successfully completes an astonishing "suture surgery" right in front of Keiun's eyes. Swirling conspiracy, suspicious beliefs, and deep-rooted traditions... Together with encouraging friends, medical doctor Koyō and crown prince Keiun confront various challenges in their country in this Chinese-style imperial medical fantasy.