Yuusha No Gawari Ni Maou Toubatsu Shitara Tegara O Yokodoroi Saremashita is a Manga/Manhwa/Manhua in english language, Seinen series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

As a member of the hero’s party, Arga hid his identity and was on a journey to subjugate the Demon King with the hero. At last the party chased the demon king, and Arga brought him down. However, the hero insists that he was the one who killed the Demon King, and then charges Arga with an innocent sin and banishes him from the Imperial Palace. The warrior who devoted his life to the hero as a part of his corp would walk a new life in a strange country town