Das Kalmarmädchen und Eiko tun sich zusammen, um am Beach-Volleyball-Turnier teilzunehmen. Ihr Ziel ist der Hauptpreis, ein 3D-Fernseher, doch auf dem Weg dorthin müssen sie sich Sanae und Cindy, Goro und Isozaki sowie Nagisa und Kiyomi stellen. Als ob das nicht schon genug wäre, nehmen noch mehr alte Bekannte am Turnier teil und die Spiele werden sehr chaotisch.
A beach volleyball tournament is held with a 3D television as top prize and Ika and Eiko decide to team up, managing to reach the finals against Gorō's team. When Eiko twists her ankle during the match point, Chizuru takes her place and wins the competition. Later, Ika's tentacles suddenly stop working, along with her other squid abilities, and the others try various methods to bring them back with no avail. Although the others suggest it would be alright if Ika returns to the sea, everyone becomes lonely when Ika doesn't immediately return. Ika later returns with her tentacles cut off, residing herself to being a normal girl, though Takeru makes it clear this isn't what makes her happy. As Ika laments on the beach, she meets a girl named Kozue Tanabe, who assures her not all humans are bad and that she is not alone. As Ika and Eiko go swimming in the sea, they are caught in a whirlpool caused by the MIT trio, and Ika's desire to save Eiko causes her tentacles to grow back, allowing her to rescue Eiko from drowning.
恒例のビーチバレー大会に、イカ娘と栄子がペアで参加することになった。優勝の景品である3Dテレビを目当てに、いつもの面々が立ちはだかる！早苗&シンディペア。悟郎&磯崎ペア。渚&清美ペア。南風の店長や3バカトリオまで登場して、勝負は混迷してゆく！
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イカ娘の触手が動かなくなってしまった。様々な治療をほどこしても回復せず、途方にくれるイカ娘。頭のピコピコも動かなくなり、イカスミまで薄まってしまったイカ娘が下した決断とは･･･？
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触手回復の目途が立たず、侵略者としての自覚、イカである事の誇りを失ってしまったイカ娘の前に･･･ふと現れたのは？
Se arma un gran torneo de voley playero en el que todos participan para ganar una TV 3D. Luego, los poderes calamarescos de la Chica Calamar desaparecen y no hay signos de que vayan a volver.
