 If you liked
Sousou no Frieren
|
 ...then you might like
Dare ga Yuusha wo Koroshita ka
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A similar story concept that that takes place AFTER the hero's party defeats the Demon King. However, while Sousou no Frieren follows a companion of the hero living decades after the grand event, Dare ga Yuusha wo Koroshita ka? focuses on a character who, four years after the Demon King's death, interviews various individuals (including the original party members) to compile a biography about the hero's life, trying to investigate how the hero died.