Ranma ½

Ranma ½ (Japanese: らんま⁠1/2⁠, Hepburn: Ranma Nibun-no-Ichi, pronounced Ranma One-Half in English) is a Japanese manga series written and illustrated by Rumiko Takahashi. It was serialized in Weekly Shōnen Sunday from August 1987 to March 1996, with the chapters collected in 38 tankōbon volumes by Shogakukan. The story revolves around a teenager named Ranma Saotome who has trained in martial arts since early childhood. As a result of an accident during a training journey, he is cursed to become a girl when exposed to cold water, while hot water changes him back into a boy. Throughout the series Ranma seeks out a way to rid himself of his curse, while his friends, enemies, and many fiancées constantly hinder and interfere.

Ranma ½ has a comedic formula and a sex-changing main character who often willfully transforms into a girl to advance his goals. The series also contains many other characters, whose intricate relationships with each other, unusual characteristics, and eccentric personalities drive most of the stories. Although the characters and their relationships are complicated, they rarely change once they are firmly introduced and settled into the series.

The manga has been adapted into two anime series produced by Studio Deen: Ranma ½ and Ranma ½ Nettōhen (らんま⁠1/2⁠熱闘編), which together were broadcast on Fuji TV from 1989 to 1992. In addition, they released 12 OVAs and three films. In 2011, a live-action television special was produced and aired on Nippon Television. Another anime adaptation produced by MAPPA premiered on October 6, 2024, broadcasting on Nippon Television and streaming on Netflix. The manga and anime series were licensed by Viz Media for English-language releases in North America. Madman Entertainment released the manga, part of the anime series, and the first two films in Australasia, while MVM Films released the first two films in the United Kingdom.

The Ranma ½ manga has over 55 million copies in circulation, making it one of the best-selling manga series of all time. Both the manga and anime are cited as among the first in their respective media to have become popular in the United States.