Next day Mousse shows up. He kidnaps Akane
"Haha come to the circus. I have curse because of you Ranma.. hahaha"
So yes Ranma went and saved Akane. The amazing show of girl changes into a koopa troopa was a facade. But Mousse turning into a koopa troopa was real however. The circus perfomance was entertaining for all who attended. In any case Mousse gets defeated in a fight with Ranma which perhaps did not suprise Nabiki who did earn money from the battle between the two martial artists. Afterwards Mousse probably left the circus but there is possibility in this universe he stayed with them.