The Alpha Cygnans — still searching for their Lost Princess — return to Earth, this time with a fleet of three thousand ships. An archaeological team in Iraq, deciphering some apocalyptic writings at an ancient site may have something to do with the approach of the Alpha Cygnans.

Meanwhile, A-ko and B-ko continue their rivalry, especially over Kei, which leaves C-ko feeling left out. A-ko and B-ko have even more reason to scrap when Daitokuji Hikaru arranges a marriage between Miss Ayumi and Kei.

The wedding takes place at the gymnasium at Graviton City High School for Girls. At the same time, the Alpha Cygnan fleet — with their Queen on the flagship — approach the City, trying to stop the wedding. The weakened Earth Defence Force try to stop them from stopping the wedding. While all this is happening, A-ko and B-ko tear apart the wedding and try to do so to each other. And Kei, Ayumi, and C-ko are caught in the middle of the melee.

Source: Wikipedia

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Prequel: Project A-Ko 3: Cinderella Rhapsody