A Ryoga from a parallel dimension slips some age reducing mushrooms onto Ranma’s plate turning both Ranma and Nabiki into little kids. Enemies come out of the woodwork wanting a piece of them both so they run away. Setsuna finds them and tells them they are reincarnated from the silver millennium and she needs them to watch over but not interfere with the other Senshi. They become friends with them all while keeping their Senshi identity secret and when the times right, Solaris Knight and Sailor Nemesis arrive to the rescue. (Sailor Moon Crossover.)