The Summer! The Sea! Akane and Nao's Stubborn Showdown!!.As Summer rolls in, Miyuki heads down to the beach to help out Akane's okonomiyaki stand, who is competing against Nao's shaved ice stand being assisted by Reika. Even after taking a break, Akane and Nao's fierce rivalry leads them to continue competing with each other as Akaoni appears for a day at the beach and instead extracts negative energy from the beach-goers. Akaoni then summons a Shaved Ice Super Akanbe with Akane and Nao letting stubbornness cause their friends to get captured. The two girls' desiring to save their friends causes them to combine their powers and free the others, allowing them to defeat the Super Akanbe. Inspired by their teamwork, Akane and Nao start selling their okonomiyaki and shaved ice together.