Dare ga Yuusha wo Koroshita ka

Four years have passed since the Demon King's defeat. Now at peace, the Kingdom launches a project to honor the deceased Hero by compiling his many achievements. As they interview the Hero's former companions—the Sword Saint Leon, the Saintess Maria, and the Great Sage Solon—everyone is evasive about the truth behind the Hero's death. "Why did the Hero die?" Was it the Demon King who killed him, or his companions? (Source: Kadokawa, translated)