The "former" savior, Takeru Yamato, was summoned to another world and executed because of his strength. When he eventually wakes up, he finds himself in Japan where he had spent time before being summoned. However, in the city, demons started appearing from "gates" immediately beginning to rampage, and those called hunters fight using magic. Returning from another world, Takeru had decided to hide his powers and live a normal life, but...

Manga original, the current ongoing Web Novel was started by the author based on the manga after it was published, as an alternative read to it as explained by the author in both WN description and Manga advertisement post in Kakuyomu

https://www.cmoa.jp/title/262000/