Koi Koi Seven

Koi Koi Seven (こいこい7) is a Japanese manga series written and illustrated by Morishige and published by Akita Shoten. Also a TV anime adaptation.

Plot
The story features a fighting squad of six girls (Koi Koi Seven) belonging to the Gokō Academy who fight daily to protect the Earth's peace and future, as well as the hopeless Tanaka Tetsuro.

Other Sources

 * Koi Koi Seven
 * http://www.animenewsnetwork.com/encyclopedia/manga.php?id=7494
 * http://www.animenewsnetwork.com/encyclopedia/anime.php?id=4862