Ankoku Kishi No Ore Desu Ga Saikyou No Seikishi Wo Mezashimasu

Briefly about Ankoku Kishi No Ore Desu Ga Saikyou No Seikishi Wo Mezashimasu manga:

This story is about a high school student Kai Kaga who was chosen to inherit the powers of an ancient spirit and become a Hero. After saving the princess Fia from monsters, he is admitted to a school that trains people in holy occupations. This story has a strong romantic element and themes of fate/destiny.