Michiru is a daughter of the owner of Akamatsu Hospital. She was kidnapped by a pirate called Runpan when she was a baby. She has grown up as Runpan's daughter, Daisy. She was raised by Kurou an island called Babahi. When Daisy and her real parents meet ten years later, they don't recognize each other.
One day, Daisy gets sick and needs blood. A doctor says her real mother's blood is the best, but her father's blood could work. Runpan loves her so deeply that he confesses Daisy is actually Mr. and Mrs. Akamatsu's daughter. Even though Daisy gets back to her real parents' place, she is shocked when she is scolded by Mrs. Akamatsu and leaves them for Runpan's place.
She and Runpan go to Babahi. But Babahi is a volcano island and it explodes. Runpan and Kurou die in the explosion...