Project A-ko is a popular comedic anime and manga series. It began as a series of four movies, and later two alternate-universe OVAs (the "Vs." series) were released. This parody series references and lampoons a number of other works of anime from the 1970s and 1980s. The title itself is a reference to a Jackie Chan movie, Project A. Production of the first movie included several artists who would later go onto become popular in their own works, including Kia Asamiya and Atsuko Nakajima. Also noted is the western production of the soundtrack of the first movie, credited to Joey Carbone & Richie Zito.

Project A-ko was initially planned to be part of the Cream Lemon series of hentai OVAs, but during the production of the series it was decided to make it into a more mainstream title. However, one can see some of the milder H elements in the series, such as B-ko's possibly lesbian sexual interest in C-ko, that were left in. The only sequence animated during its Cream Lemon days left in the revised production is B-ko's private bath scene.

The English language version was produced and released by Central Park Media and was one of the first Anime series brought to the western market. It has had a profound impact in Japanese animation and manga and has become a benchmark and a cornerstone of the industry ever since. While not the most outrageous anime anymore, it was once considered to be over the top and ushered in a new style of humor that is common to many Anime today.

The first Project A-ko movie is often considered the best of the series, and is known for its clever blend of action, screwball comedy, and satirical jabs at anime conventions.

The plot revolves around Eiko (or, "A-ko") Magami, a red-haired girl who just happens to be stronger and faster than anyone else alive. However, A-ko considers herself to be perfectly normal, and worries mostly about getting to school on time. Her best friend is Shiiko (or, "C-ko") Kotobuki, possibly the whiniest case of arrested development in anime history. The two girls transfer to Graviton High School and catch the attention of Biko (or, "B-ko") Daitokuji, a brilliant (but spoiled-rotten) classmate with a knack for building humongous mecha in no time flat.

B-ko develops an unexpected crush on the innocent C-ko, and is determined to get A-ko out of the picture at any cost. Her determination goes from being merely obsessive to homicidal when she realizes that she and A-ko were rivals back in kindergarten, and creates a series of killer mecha to defeat A-ko before the morning bell rings. All of them are trounced effortlessly by A-ko. In a final attempt at victory, B-ko makes the fight more personal by donning her infamous Akagiyama-23 battlesuit and challenging A-ko to a donnybrook that devastates the school and a good part of Graviton City...

...meanwhile, Earth is being threatened by an impossibly humongous spaceship from the aliens of the Lepton Kingdom of Alpha-Cygni, who have come to Earth to retrieve their long-lost princess, who turns out, strangely enough, to be none other than C-ko.

From Wikipedia