Mermaid Melody Pichi Pichi Pitch #4

Plot

Lucia Nanami, a mermaid princess, has taken human form to find her fellow princesses and save the seven seas from the evil rule of a would-be emperor, the ambitious Gackto. And now Gackto has kidnapped the boy Lucia loves. A final battle is inevitable, but Lucia has found only four of the seven mermaids, and defeating Gackto requires the magic power of all seven!