Dare ga Yuusha wo Koroshita ka

Four years have passed since the Demon Lord was defeated. The kingdom, now at peace, has undertaken the task of compiling the many great deeds of the fallen Hero, interviewing the members of his former party: Leon the Sword Saint, Maria the Holy Maiden, and Solon the Sage. Yet in between their tales of the Hero's past and their adventures together, the truth about his death slowly comes to light. Who killed the Hero? The Demon Lord? ... Or his comrades?
(Source: Yen Press)