A salaryman meets an untimely demise and gets reincarnated in a fantasy world...
The Great Cleric
Season 1 Episode 10: The Secret of Substance X
Luciel agrees to heal the adventurers in Shurule but demands that they stop calling him "maso-zombie." Cattleya realizes Luciel has been consuming Substance X and informs the pope, who explains the origin of the mysterious drink.