In a magical realm threatened by daily dangers to demi-humans, a mysterious hunter emerges, swiftly appearing amid incidents involving these beings. Surprisingly, he seems to be proposing to monster girls at the heart of these events. While this may sound perplexing, the truth is he is the youngest prince of the land, harboring a peculiar fondness for monster girls. Tasked by the king to marry these unique creatures to restore peace, he embarks on a journey to wed a diverse array of girls, from a rough yet endearing orc to a enigmatic unicorn, a mysterious jellyfish, and a charismatic dragon. Embracing his destiny, he sets out to create his own harem, fostering a tale of fantasy entwined with love for these extraordinary beings.