Strawberry Panic! (ストロベリー・パニック! Sutoroberii Panikku!) started off as a series of Japanese fictional short stories written by Sakurako Kimino and illustrated by Chitose Maki. Since it's initial incarnation, it's gone on to expand into other media, including a manga, three light novels, an anime, and more.
Strawberry Panic! is a short lived manga adaptation of the orginial short stories.