Akané takes part in the hunt for monsters in an invading forest of giant animals. She finds there an old man and her grandson living alone in this forest. Akané remembers that the grandson, called Shinnosuke, had saved his life a long time ago. The latter was then seriously wounded and only the water from the magical spring of the forest allows him to stay alive. Unfortunately the source is taric. Akané decides to do everything to save his life, which is not the taste of Ranma who is a little jealous. It's not beautiful that!