The Goddess's Beloved Daughter Who Saves the King

An ordinary 17-year-old high school student, Minato Kousaki, has always felt a sense of discomfort with the world in which his family and he live. One day, he meets a man named Leivaith from another world at his favorite pond, and Minato learns that his true identity is a unicorn called the Beloved Daughter of God. The Beloved Daughter of God is destined to be united with a king from a certain country in another world, and Minato comes to meet Lian, who is that king... That's the kind of something-or-other story this is.