Tochigamisama no Sono Higurashi

As a priest (healer) of the Hero's Party, Kousei Kiyogami helped defeat the Demon King. But when he finally returns to his original world, 22 years have passed. Having grown far too powerful in the other world, Kousei's divine energy is no longer human in scale, and the local onmyoji begin treating him as a living god.

(Source: Kadokawa, translated)