Now then, let the treatment begin!　Doctor x Monster x Battle Action! In a world where humans and monsters coexist, monster doctors are those who risk their lives to fight and protect the mysterious pathogens that are invading the world! Nagi, a boy with the core of a slime dragon in his body, has a constitution that allows him to assimilate any substance and understand the minds of monsters. Together with his partner Pom, Nagi decides to become a monster doctor in order to discover the cause of his father's disappearance and the mysteries of the world. A fantasy of bonding and adventure between a boy and a monster... The treatment begins!!