In a world ruled by idols, Yuri rose to the top. Her charm unified the world, and she became the elected President. Upon her retirement, she chose six Excellent Idols as her successors. Mimu is a high school girl who wants nothing more than to be like Yuri, and sing in Crystal Hall.
Her dream brings her together with the six Excellent Idols, and they embark on a quest into the Tropical Dimension. This world is in peril, and it can only be saved by swimsuit contests, obstacle courses, mud wrestling and, of course, idol singing!