第 159 集: 亂馬與小茜為學校尋找海馬，而豆腐博士於颱風期間造訪

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Ranma and Akane discover a seahorse in the ground on their way back home, in which Ranma decides to use it as a class project. Concurrently, Kasumi Tendo invites Dr. Tofu Ono to the Tendo household due to a severe typhoon watch. Later on, they are visited by the frog hermit, who has an ulterior motive for showing up. Dr. Tofu realizes that the seahorse is actually a dragon. It is learned that the exposure to the whirlwind will increase the growth of the dragon and the consumption of dragon flesh will grant immortality. (Source: Wikipedia)