According to Fujimishobo, light novel "Yusha ni Narenakatta Ore wa Shibushibu Shushoku wo Ketsui Shimashita." (I reluctantly decided to find a job because I couldn't become Yusha.) was announced to get an anime adaptation.

Sibuyu novel official website

Synopsis:
The story takes place in a fantasy world where the northern land of a continent has been ruled by a devil king. People who are qualified to be "Yusha" by a national exam will be sent to the devil king's land to combat the demons. Raul Chaser is the top student at the prep school for becoming Yusha when the Yusha system is abolished after one Yusha defeats the devil king. Raul struggled to find a job in the middle of the recession due to the fall of the devil king's kingdom, and finally he manages to become a clerk at a small magic item shop. One day, an applicant for a part-time job visits his shop. The girl, Phino Bloodstone, is the daughter of the defeated devil king.

Yuusha ni Narenakatta Ore wa Shibushibu Shuushoku wo Ketsui Shimashita. on MAL