魔王によって衰退した人類の存続には勇者の血が必要と考え至った王国は、
勇者にたくさんの女性と子孫を残してもらい子孫繁栄を義務付けた。

以下勇者に渡された書状より抜粋

その１
勇者は子孫を残す女性を選ぶことができるものとする

その２
この書状を読んだものは勇者の子孫を残すことを拒否することはできない

その３
できた子供は国で支援するのでいくらでも産んでよいものとする

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魔王を討伐したまだ若き勇者には酷な王命だったが、
そんな勇者を好いている者が数多くいるのも事実であった。

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.

Below is an exerpt from the note that was passed along to the Hero

No. 1
The Hero is able to decide the women who will bear his descendants

No. 2
Those who read this note will be unable to refuse bearing the Hero's descendants

No. 3
The children born will be supported by the state, so the more born, the better

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For the still young Hero that defeated the Demon Lord, this seemed a tall order from the crown,
but there were, in fact, actually quite a number of people that were fond of such a Hero.