Happosai was born a girl and cursed into a boy, however his female soul needed female ki thus he became a pervert. His advanced age means he can no longer absorb the ki he needs and he is dieing. Ranma has to take him to China to find his stash of cursed girl water and change him into a young girl. After Curing Happosai they spend weeks in a modern Amazon village learning new moves and medicine And Ranma learns of a way to control her curse, however she has to spend at least half her time as one. They return home with Happosai now named Noriko getting used to her new life.