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

Synopsis

The demi-humans living in the magical country are threatened everyday. Lately there has been a mysterious hunter appearing in several places. Appearing as swift as the wind whenever incidents involving demi-humans come up it seems like he is... proposing to the monster girls in the center of these incidents. What are you even saying?... is what you might think, but it can't helped.. The hunter is turning all kinds of girls into his bride including but not limited to: A rough but cute orc girl, a silent unicorn girl, a mysterious jellyfish girl and a really cool dragon. The truth is, he is the youngest prince of the magical country and he's into monster girls. To bring peace to this country he has to marry all monster girls - that is the mission he has been given by the king. I see, i guess i'll have to create my own harem then, huh... Can't be helped! A fantasy harem story full of love for monster girls! (Source: Kadokawa)