Squid Girl and Eiko pair up to join the beach volleyball tournament. With sights set on the grand prize of a 3D TV, the usual faces stand in their way: Sanae and Cindy, Gorou and Isozaki, Nagisa and Kiyomi. Even the owner of the South Wind and the Idiots Three enter as the matches become chaotic! Squid Girl's tentacles stop working. Various treatments to restore them are unsuccessful and Squid Girl is at a loss. Finding the flapping things on her head also won't move and even her ink is weak, Squid Girl makes the decision to... With no prospect of restoring her tentacles, Squid Girl has lost both her invader self and her pride as a squid. Suddenly before her appears...?