勇者の代わりに魔王討伐したら手柄を横取りされました (Associated Names)

As a member of the hero’s party, Arga, who had to hide his identity, was on a journey to subjugate the Demon King. At the end the party fought the demon king, and Arga brought him down. However, the hero insists that he was the one who killed the Demon King, and then he charged…