Ranma 1 2 : Big Trouble in Nekonron China

Ranma ½ (pronounced Ranma one half) (らんま½, Ranma Nibun no Ichi?) is a Japanese manga series written and illustrated by Rumiko Takahashi with an anime adaptation. The story revolves around a 16-year old boy named Ranma Saotome who was trained from early childhood in martial arts. As a result of an accident during a training journey, he is cursed to become a girl when splashed with cold water, but hot water will change him back into a boy.

In Japan, the manga was serialized in Shogakukan's Shōnen Sunday where it ran from 1987–1996. Takahashi has stated in interviews that she wanted to produce a story that would be popular with children. Ranma's main audience was boys from elementary to junior high school age.

Ranma ½ was extremely popular among American anime fans in the 1990s and popularized many of anime's most common visual gags. The infamous 'cursed springs' plot device has even come up in anime-themed custom role playing games as a quick transgender device.

Source: Wikipedia