Alice

Alice is the princess of mermaids. He had been living in the sea for many years and wanted to get out of the sea and go to the shore, but Alice's parents did not allow him to do so. But after many years, Alice grew up and her parents wanted to force her to marry the eldest son of one of the sea monster kings. to prevent the war between the mermaids and the water monsters, but Alice escapes right on the wedding night and comes to the beach where she sees you, you are the son of the demon kingdom and you came to rest for a while