Parallel World Pharmacy

is a Japanese light novel series written by Liz Takayama and illustrated by keepout. It began serialization online in July 2015 on the user-generated web novel publishing website Shōsetsuka ni Narō. It was later acquired by Media Factory, who have published 8 volumes since January 2016 under their MF Books imprint. A manga adaptation with art by Sei Takano has been serialized online via Kadokawa Shoten's ComicWalker website since November 2016. It has been collected in 8 tankōbon volumes. An anime television series adaptation by Diomedéa premiered in July 10, 2022 and is expected to run for 12 episodes to September 25, 2022.

Plot
World-class medical researcher Kanji Yakutani lost his little sister to a tumor years ago due to ineffective treatment. To honor her legacy, he has dedicated his research to developing new medications for such conditions. But as fate would have it, he overworks himself and passes away at the age of 31, only to be given a second chance at life in another world.

When he wakes up, Kanji finds himself in the body of a 10-year-old boy named Falma de Médicis, the son of an esteemed family of medical practitioners in the Sain Fleuve Empire. Bearing the mark of a deity's divine blessing, Falma is capable of performing a unique divine art, allowing him to create and reduce any substance with the knowledge of its chemical properties.

After reading through some pharmacology books, Falma realizes that this world is operating on similar medical practices as in ancient times. He also learns that medicine is an exclusive privilege to the nobility, depriving commoners of proper medical care. Using the knowledge from his past life and the divine abilities granted to him, Falma resolves to make medicine available to those who need it—irrespective of class.