S.A (S・A（スペシャル・エー）, S・A (Supesharu Ē)?), also known as Special A, is a shōjo manga by Maki Minami. Serialization started in ZA Hana to Yume, only appearing bimonthly. After Chapter 4 the manga became serialized in the biweekly magazine Hana to Yume. Special A has been licensed in Asian countries, Germany, and the U.S. (by VIZ Media). Currently there are 14 published volumes (in Japan). In 2007, Hana to Yume announced that Special A would have an anime adaptation, animated by Gonzo and AIC; the animated series ran for 24 episodes from April 6, 2008 to Sept 14, 2008 in Japan.

Source: Wikipedia