Ouji no Ninkatsu Shinanyaku no hazu ga, Katabutsu Ikan-sama ni Dekiai Sareteimasu

https://mechacomic.jp/books/279226 Onora, an abandoned child with mysterious powers, was taken in by the pharmacist Kai and raised as his apprentice. By chance, she ends up going to the royal harem in place of her master Kai to act as a fertility advisor to the princes of the kingdom, who are grappling with the issue of succession! William, the physician who suddenly pushes Onora down when they first meet, seems like a lecherous nobleman... but in reality, he's an extremely strict man with no experience with women, and he says, "I will never have a romantic relationship with you," and it seems there's something going on... Furthermore, Prince Ethan, the first prince whom Onora is supposed to advise, also starts to make advances on her──!? What is the 'curse of infertility' placed on the royal family, and what secrets are hidden in William's past? A heart-pounding romantic fantasy unfolds in the royal harem, filled with love and hate, between a physician with a secret and a fertility advisor pharmacist! *This work is a comic adaptation of the popular novel "It Seems I've Been Chosen as the Prince's Fertility Advisor" from the novel posting site "Everystar".