Kono Sekai wa Fukanzen Sugiru

Nikola was a simple girl who lived in the village in the world of monsters and dragons and worked in the inn. One day some dragons invaded there and destroyed everything then she met with Haga. Haga protected her and now she remains with him. Haga is a part of a special society that makes sure of the peace on earth and protects people. They come close to each other but both have secrets they hide from each other.