It is Spring Break for the students of Graviton High. While B-ko plots to whisk C-ko away to some secluded location, C-ko dreams only of spending time with A-ko, having fun as usual. A-ko, however, has other plans. She decides that it is time to stop hanging around with C-ko and find a boyfriend.Unsatisfied with her wardrobe, she gets a job at a local fast food restaurant to earn money to buy new clothes. This leaves C-ko feeling quite lonely, so she spends most of her days waiting for A-ko to get off of work.One day, A-ko (literally) runs into Yuki Kei, a handsome biker. To her great delight, Kei returns to the restaurant where she works and seems to hang out there. B-ko also notices Kei and decides to steal him from A-ko. Later, C-ko sees A-ko and Kei arriving on Kei`s motorcycle. She runs up to A-ko and snarls and hisses at Kei like a feral cat, angry that he is robbing her of A-ko`s affections.A-ko and B-ko`s battle for the habitually silent Kei culminates in a disastrous date at the Alpha Cygnans` Space Hotel. During the posh event, A-ko realizes that she removed her armbands which keep her powers under control. Without them, her strength is so great that it obliterates everything she touches. The destruction spurs Graviton City`s overenthusiastic Public Works Defence Force into action. This colourful all-volunteer force (of which Miss Ayumi is a proud member) assemble from all corners of the city, clad in superhero outfits and piloting a small army of various mecha.Just when it seems that all hell is going to break loose, A-ko and B-ko`s melee comes to an abrupt halt when Kei reveals his love for C-ko. But C-ko utterly rejects him. A-ko and B-ko are both crushed and disappointed, but A-ko does find joy in being with her best friend again.
- Other Title: Project A-Ko 3: Cinderella Rhapsody, プロジェクトA子3 シンデレララプソディ, プロジェクトA子3 シンデレラ・ラプソディ, PROJECT A-KO 3 シンデレラ・ラプソディ
- Status: Completed
- Sub/Dub: Anime Dub
- Anime Type: OVA
- Genres: Action, Comedy, Mecha, Sci-Fi, Super Power, Ecchi, Romance, Shoujo Ai, Animation, Science Fiction
- Characters: Daitokuji, Biko, Kei, Kotobuki, Shiiko, Magami, Eiko
- Score: 6.33
- Rank: 7658
- Popularity: 7607