After losing his little sister to an incurable condition, world-renowned medical researcher Kanji Yakutani dedicated his life to discovering new medicines in order to treat people. The former pharmacist wakes up as a 10-year-old child whose body has been hit by lightning after working himself to death at the age of 31. He realizes that he has been reincarnated as Falma, a child of the respected De Médicis family, in a medieval world. Falma understands that his body is host to the guardian deity of medicine in a world where divine arts—magic bestowed through blessings from guardian deities—exist. The youngster has been endowed with the mythical divine talents of creation and reduction, as well as the capacity to identify disorders in people's bodies quickly.