Known as Sta☆Ska in Japan, is an Otome game developed by Honey Bee in 2009. It was well received in Japan, so it was adapted to anime.
Yahisa Tsukiko is the only woman Seigatsu Academy, a school that was once just for kids. She has her childhood friends, Kanata Nanami and Suzuya Tohzuki, which protect it from the male students. Throughout the games, she befriends other young men whose personalities are based on zodiac signs.