The Banished Former Hero Lives as He Pleases: Volume 4 by Shin Kouduki

Allen and his friends hurry to escape the Viktor Empire, but they are apprehended at the last minute by a familiar young man begging for their help. He introduces himself as Curtis, Anriette’s cousin, and asks for assistance in rescuing her after the empire arrested her, believing her to be the ringleader in the plot to kill the emperor. It looks like Allen, Riese, Noel, and Mylène will be extending their stay for a while longer! Their mission will mean clashing with the Knights of the Black Wolf, an elite fighting force composed of criminals condemned to death. Will Allen be able to overcome such a fearsome foe and rescue Anriette from the cruel fate that almost certainly awaits her? And can Curtis even be trusted?