Abandoned at the age of five by her mother, deaf and mute Mahiru Morita's life has been filled with sorrow. Living with adoptive parents in Okinawa, she is also routinely treated cruelly at home and at school. But hope springs eternal as she dreams of one day finding her true mother living in far-off Tokyo. Can her dream come true? When young Kazuki, a young man attending university in Tokyo, comes to visit Okinawa on a scuba diving expedition, a life-threatening incident brings the two young hearts together. As their adventure unfolds, young Kazuki recounts to Mahiru the fable of how a young girl is showered with coins from heaven in admiration of her purity of heart. Is Mahiru the one?