Lamenting over their last battle, Megumi and Hime decide they need to train their bodies. Seiji takes them to his local karate dojo where Iona also practises, along with Megumi's friend Kazumi. The girls are impatient to learn about the advanced fighting techniques, but Seiji insists they start with basic techniques. The next day, as Kazumi nervously prepares to take an exam to improve her rank, she is targeted by Oresky, who creates a Karate Saiark to attack the dojo. As the Cures rush into attack, Megumi is injured from defending Hime from a feint attack. Just as things look their worse, a mysterious new Pretty Cure named Cure Honey uses a soothing song to put the Saiark under her control and give the Cures the encouragement to defeat the Saiark using the techniques they learnt from Seiji. After Cure Honey takes her leave, Kazumi is encouraged to try her hardest in her exam.
Note: Cure Rhythm celebrates the 10th anniversary.
ひめからパーティーの招待状をもらったの！ でも、準備をお手伝いしようとしたら、なぜかひめは怒り出しちゃった…。そこにサイアークが現れて大ピンチ！ だけど私たちは友達。ピンチを乗り越えて、新しいコラボ技が出ちゃう!?
