Where does the other body of the Jusenkyo-cursed disappear to? And what happens to it? The answer is a different kind of isekai. An aqua-isekai.

While battling the devilish Pantyhose Taro, Ranma meets Kousaku Hatanaka and Sister Angela of Rumiko Takahashi's One-Pound Gospel. In the end, he learns something that might help him save Helene after he's gone Back in Time.