Confined in the castle tower by her father, princess Arete spends her days watching the world outside her window. Sometimes she seeks out to watch the common people at work. The knights of the kingdom compete for the right to marry her and rule the land by competing to see who can find powerful magic objects made by a long dead race of sorcerers. Arete wants none of this. She longs to meet the common people and travel to exotic lands she has only seen in the books she keeps hidden under her bed. One day the sorcerer Boax arrives in a fantastic flying machine and offers to take Arete as his wife and transform her into a proper princess.

Telegraph Pole Society, a mysterious group, is planning to conquer the world. The principal of the local high school forms a Defense Force by recruiting students from school: Shogi Morita, Kuho Tasuke, and Akiko Ifukube. Meanwhile the high school crazy scientist, Dr. Inogami, has turned a local boy, Kami Sanchin, into a cyborg. They might just defeat the Telegraph Pole Society with the help of the cyborg, or maybe not...

Announced at the "Pretty Rhythm Christmas -Prism Stage- Event," the movie will compile Prism Show scenes from all three seasons. Residents of the Prism World Momo and Penguin-sensei work together to introduce various Prism Shows throughout the history of Aurora Dream, Dear My Future, and Rainbow Live. Within the many Prism Shows performed by Aira, Mia, Naru and their friends, only ten rank on top.