Soun Tendou runs the Tendou Martial Arts School accompanied by his three daughters: Akane, Nabiki, and Kasumi. One day, the sisters' lives are turned upside down when their father announces that he has promised one of them to be married to a fellow martial artist's son in hopes of carrying on the family legacy. In addition to their mixed reactions, when the fiancé arrives, the last thing the Tendou family expects is Ranma Saotome and his father, Genma.