Monster Musume Hunter: Subete no Monster Musume wa Boku no Yome!

A magical country is home to demi-humans who face daily threats. A mysterious hunter has recently emerged, appearing quickly at incidents involving these beings. Instead of fighting, he proposes to the monster girls involved. The hunter, identified as the youngest prince, has been tasked by the king with marrying all monster girls to restore peace. His collection includes an orc girl, a unicorn girl, a jellyfish girl, and a dragon. His mission requires him to build a harem of monster brides.