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.