Reginetta-san no Bouken Episode 01
(18禁アニメ) [240830] [魔人] リジネッタさんの冒険 第1話 格安別荘は事故物件 浜辺のスライムと謎の遺跡

◯◯ Kouhai Vol.09
A special governmental program has been introduced to counteract the declining birth rates of demi-human races suffering due to a lack of male members. Through a so-called "assistance system," randomly selected humans are required to mate with designated partners—be it elves, sirens, or even dragons. Source: MyAnimeList