The Great Cleric

A salaryman gets reincarnated in a fantasy world as a fifteen-year-old boy named Luciel.

Luciel starts to get a handle on his healing powers and what it's going to take to improve them and survive in this new world, so he charts a course for a rather unexpected training destination — the Adventurers' Guild!

Luciel registers with the Adventurers' Guild and begins martial arts training with chief instructor Brod. As part of that training, he is forced to drink Substance X, a mysterious and disgusting beverage that confers special powers like a cheat item.

Luciel is given a break from training to learn about butchering monsters with Gulgar's brother, Galba, and study world history and culture with Nanaella. While shopping with Nanaella one day, he discovers Monika unconscious and bleeding on the street.

Luciel needs to renew his registration at the Healer's Guild.

After Luciel's encounter with Bottaculli, Brod decides that he'll need to get even stronger to survive whatever the corrupt healer might throw at him. Little do they expect the mysterious letter that's about to arrive and change everything.