A virus wipes out most of mankind leaving behind only those cursed by Jusenkyo, but the virus locks curses. Ranma stuck in girl form protects Shampoo from getting splashed until the virus had passed, but Ryoga, Mousse and Genma are locked. Taro happens by in his mixed curse form with a wife who is a cursed cat, he unlocks all the curses and they realize they need to make children. To create a larger gene pool, Ranma decides to become a mother as well.