露西亚，来自北太平洋的美人鱼公主，登陆寻找她七年前由海中拯救的男孩，当时这位男孩溺水了，她用粉红色的真珠救了他一命，并且把她最珍贵的粉红色珍珠交给那位男孩。七年后她为了继承一事来到了陆地去寻找以前的男孩要回真珠，最终找到了那个男孩，名叫堂本海斗，但是化身成人形的露西亚，名叫七海露西亚的女孩，与她的人鱼型态并不相似；她也不能告诉海斗她真正的身份，否则她将变成泡沫。因此她努力的让海斗去想出她的真正身份。 与此同时，露西亚知道有一群水妖已经入侵海上世界。她必须聚集七位美人鱼公主和她们的真珠，使得传说中的海洋女神阿克安·雷芝娜女神复活，并阻止水妖们的阴谋。为了这样，她与另外六位来到陆地的美人鱼公主波音、莉娜、香莲、诺爱儿、可可和沙罗联手，使用她们的珍珠变成歌唱偶像，以她们的歌声作为攻击武器去对付水妖。
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