Kip. 57: The Last Days of Happosai...

57

Miyo, a divination schoolmate of Akane, tells Akane that she and Ranma would marry within a week and something bad will happen to Happosai. As Happosai becomes feverish, Soun and Genma decide that Ranma and Akane will marry in case the old man were to die. Eventually, everyone else but Akane falls ill as well, forcing Akane to make a special medicine to make everyone well again and postpone the wedding. (Source: Wikipedia)