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Artist's commentary
Having Defeated the Demon Lord, the Hero's Next Task is Perpetuating His Descendants -Maid-
In order to secure the survival of humanity after going into decline due to the Demon Lord, the Kingdom came to the conclusion that the Hero's blood is necessary;
therefore, the Hero was ordered to perpetuate his descendants by having many women bear said descendants.
A maid that worked at the castle was among them; as this maid sometimes accompanied the hero, she was recruited to help with the task of perpetuating the Hero's descendants.
Despite being ordered to, she was in no way opposed to this; in fact, it is said that she herself actually desired to help with perpetuating his descendants until the very end.