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.
- Other Title: Project A-Ko 4: Final, Project A-Ko: Kanketsuron, Project A-Ko: Love and Robots, プロジェクトA子 -FINAL-, Project A-ko: Love & Robots, Project A-ko: Love & Robots
- Status: Completed
- Sub/Dub: Anime Sub
- Anime Type: OVA
- Genres: Action, Comedy, Sci-Fi, Mecha, Super Power, Ecchi, Romance, Space
- Characters: Daitokuji, Biko, Kotobuki, Shiiko, Magami, Eiko
- Score: 6.39
- Rank: 6991
- Popularity: 7859