Isekai Yakkyoku

Kanji Yakutani had lost his sister to a tumor. He dedicated his life to honering her legacy by creating new medications. Despite his efforts, he passed away at the age of 31. But in his afterlife he was given a second chance.

Kanji woke up in the body of Falma de Médicis, a 10 year old boy with an esteemed family of medical practitioners. With a divine blessing, Falma was able to create, reduce and recognize any substance with the knowledge of its chemical properties. He realized that medicine was a privilege for the nobility, so he made it his mission to make medicine available for all, regardless of their class. He would use his divine powers to make sure no one was deprived of proper medical care.