誰が勇者を殺したか (Series) favorite_border

The brave man defeated the Demon King. At the same time - he never returned. 　Four years have passed since the Demon King was defeated. The kingdom, now at peace, launches a project to compile a book of the hero's many feats in order to honor the deceased hero. 　As the kingdom hears of the hero's past and adventures from his former companions, Leon the knight, Maria the priest, and Solon the sage, they all remain silent about the truth behind the hero's death. Why did the hero die? 　Was it the D...