This series follows the adventures of a gender-swaping pigtailed-boy that's a huge trouble magnet: His name is Ranma Saotome, he's 16 years old.Ranma ½ is a Japanese manga and anime series written and illustrated by Rumiko Takahashi. The first anime series, Ranma ½ , ran from April 15, 1989 to September 16, 1989; whereas the second, more successful anime, called Ranma ½ Nettōhen, ran from October 20, 1989 to September 25, 1992. The series has a total of 161 episodes. The series starts out with a pigtailed girl running from a strangely violent panda on a rainy day. The girl keeps yelling something about not wanting anything to do with some dumb arranged mariage somebody set up for her.
Soon after the chase ends and the panda subdues the red-head, the scene cuts to an middle-aged man in an old gi. He reads a postcard adressed from China and proceeds to call his three daughters, Kasumi, 19, Nabiki, 17, and Akane, 16, to the main room of their home. He explains an old friend of his is coming very soon with one of their soon-to-be fiancee. He got a response of protest from Akane but sparked the interest of Kasumi and Nabiki.
A few moment later, there was a knock at the door and the father, Soun Tendo, and Nabiki rushed to get the door. The panda from earlier with a now very awake and lively girl over his shoulder were on the other side and quickly made their way to where Kasumi and Akane were still sitting around. When the girl is set down on the floorboards, Soun asks the question: "Are you Ranma?", and the girl sadly answers: "Yes...," and chasos ensues quite soon.
If you wish to learn more, you can find the entire series, in english subs and dub, on youtube; if you want to read the manga it's on anymanga.com and many other sites.