Kaguya Yamabuki is a mysterious and enigmatic character in the anime series 'Shining Hearts.' She is discovered washed ashore on the island of Windaria with no memory of her past, carrying only a large crystal. Kaguya possesses an ethereal beauty and an aura of mystery that captivates those around her. Throughout the series, she plays a central role as the key to the island's secrets and the unfolding events that shape the destiny of the characters. Her interactions and relationships with the main characters drive much of the series' plot.