(from ebookjapan):
"Eighteen mon per dose." ─ A famous doctor, Dr. Tokuhon Nagata, who treated shoguns, townspeople, and prostitutes alike for a mere 18 mon. Some call him a good doctor, others call him a quack. One day, a messenger of Shogun Iemitsu arrives from the castle. ......? The activities of the legendary medical saint Nagata Tokumoto are revived in Shotaro Ishinomori's medical humanistic jidaigeki!