A Woman's Love is War! The Martial Arts Rhythmic Gymnastics Challenge!
Onna no Koi wa Senso yo! Kakuto Shintaiso de Iza Shobu
"Upon finding out that Ranma is Akane's fiancé, Kodachi decides to wager him on the next match. But when Akane sprains her ankle during training, it's Ranma who stands in for her?! " (source)