In a remote village, two doctors, the young and beloved Osanai and the seasoned and ambitious Tatsugaura, delve into the enigmatic 'Monmow' disease. This ailment distorts bones, transforming sufferers into beastly figures before their demise. Tasked by Tatsugaura, Osanai ventures to the village to investigate the illness and provide care to those afflicted. Unbeknownst to Osanai, Tatsugaura harbors treacherous intentions, aiming to infect his colleague with the disease. This sinister plot serves Tatsugaura's ulterior motive – to eliminate Osanai as competition and elevate his own medical standing through deceit and manipulation.