The Great Cleric Manga Series by Broccoli Lion, Hiiro Akikaze, sime

It won the Narō Contest’s Gold Prize! It took #1 in Shōsetsuka ni Narō’s quarterly ranking! Now The Great Cleric is finally getting a comic adaptation!! A salaryman collapsed from a gunshot wound. When he came to, he had been reincarnated in another world as a fifteen-year-old healer with a talent for Holy magic named Luciel. In order to survive in this new world, he first decides to build up his body and begins intensive and strict training... moreIt won the Narō Contest’s Gold Prize! It took #1 in Shōsetsuka ni Narō’s quarterly ranking! Now The Great Cleric is finally getting a comic adaptation!! A salaryman collapsed from a gunshot wound. When he came to, he had been reincarnated in another world as a fifteen-year-old healer with a talent for Holy magic named Luciel. In order to survive in this new world, he first decides to build up his body and begins intensive and strict training. Enduring physical training and awful flavors, his masochistic zombie streak takes root in this, the first volume of The Great Cleric!! less

It won the Narō Contest's Gold Prize! It took #1 in Shōsetsuka ni Narō's quarterly ranking! Now The Great Cleric is finally getting a comic adaptation!! A former salaryman was reincarnated in another world as a Healer. Despite being a Healer, he spends his days drinking a super disgusting cheat beverage called "Substance X" and undergoing intense training at the Adventurers' Guild... And there he progressed until, one day, everyone decided he must be a masochist!

Luciel has reached the thirtieth floor of the underground labyrinth. But when Cattleya sees him thriving despite his dangerous mission, she begins to suspect he may be taking strange drugs... which rings one very smelly bell in Luciel's mind: Substance X! Is it finally time to reveal its secrets?!