Kaito has finally returned, but he has lost his memories of Lucia and everything that involves the ocean! Hanon has also found herself a suitor, Nagisa Shirai, who seems to be the retriever of the music sheet Taro gave her. To make things worse for Lucia, Kaito is with another girl, Michal, who is Rihito's sister, causing Lucia to fall into deep depression and vow she will restore Kaito's memories.