After a tragic death due to overwork, a young pharmacologist from Japan finds himself reborn in a Medieval Parallel Europe. Reincarnated as a 10-year-old apprentice under a renowned Royal Court pharmacist, he possesses extraordinary abilities to diagnose diseases, create and destroy materials. In a society plagued by unethical medical practices and exorbitant prices controlled by the pharmacist guild, quality medicine remains out of reach for the common folk. Acknowledged by the Emperor, he establishes a corner Pharmacy to combat the pervasive fraud and offer genuinely effective treatments based on modern pharmacology. Leveraging his past expertise, the boy pharmacist pioneers revolutionary remedies while enriching the lives of the parallel world's inhabitants—a tale of seizing the opportunity to thrive in his new existence.