Watashi no Neko wa Ouji-sama

Two sisters, Miyako and Akane, await their father's return from a business trip and speculate about the gifts he might bring. Their father gives Akane a necklace made of shells or stones, but Miyako receives something unexpected—a boy. The young man is tall, handsome, with tanned skin and long blond hair. He introduces himself as Kyatto, the prince of the island their father visited. He is nearly 15 years old and declares that he now belongs to Miyako, claiming she is his wife and that their union is fated by destiny.