A pharmacologist from Japan who died from exhaustion awakens as a 10-year-old apprentice in a parallel world resembling medieval Europe. In this fantasy realm, he discovers himself blessed with extraordinary abilities—the power to diagnose any disease by sight, manipulate matter itself, and destroy harmful substances at will. Positioned as an apprentice to the Royal Court's prestigious pharmacist, he witnesses a system plagued by corruption: guilds monopolize medicine production, inflate prices beyond reach, and leave common people suffering without access to effective treatment. When the Emperor recognizes his exceptional talents, the young prodigy gains opportunity to establish his own pharmacy. Determined to revolutionize healthcare, he utilizes his previous-world knowledge of modern pharmacology combined with his supernatural gifts to create innovative medicines previously impossible in this realm. His vision expands beyond profit: exposing fraudulent practitioners, dismantling the guild's monopoly, and ensuring that genuine, life-saving medicine reaches those who need it most. Through his talents and unwavering commitment, the reincarnated boy pharmacist reshapes the medical landscape and finds renewed purpose in his extraordinary second chance.