With Pikarigaoka celebrating Halloween, the girls invite Blue to join them for a costume parade, much to Seiji's dismay. As everyone becomes obsessed with sharing pumpkin cakes, Hime becomes concerned about Seiji, who is jealous of Blue growing closer with Megumi. Just then, Oresky attacks with a Pumpkin Saiark, desperate to prove himself as number one after learning Mirage is planning to bring out a stronger enemy. With Megumi hearing about Oresky's fears of being considered worthless if he can't be the top, the Cures defeat the Saiark and attempt to purify Oresky, but their Big Bang attack…