@Michiko found it on mangaDex
"Mou.... Hatarakitakunaindesu" Boukensha Nanka Yamete yaru. Imasara, Taiguu wo Kaerukara to Onegai sarete mo Okotowaridesu. Boku wa Zettai Hatarakimasen.
Or
I... Don't Want to Work Anymore. I Quit Being an Adventurer For Good and You Can't Stop Me.
Or
I... Don't Want to Work Anymore. I Quit Being an Adventurer For Good and You Can't Stop Me.