''Starts with a interesting fact about Ranma-chan coming to the attention of Nodoka and Akane.
Akane is worried. Ranma has been in the bathroom a long time. When she and Nodoka go up there, something is definitely wrong, Ranma is in girl form and throwing up in the bathtub. Apparently this happens every month and Ranma can't even change back while it's going on. Ranma has more problems as well, seems he can't get excited by girls OR boys. Nodoka thinks it's time Ranma came more to terms with his girl side, so for the next month, she's going to be her daughter...