Incensed at the damage done to the sea and its wildlife at the the hands of humanity, Squid Girl rises from the depths of the ocean to enslave humanity! Her mission proves more difficult than it first seems, however, when she gets dragooned into working at the Aizawa beach restaurant. Will the easily distracted, blissfully ignorant, and slightly thick Ika-Musume convert her managers' humble house into her base? Will she use the power of her mighty tentacles to bring all of humanity to heel? Or will she at least learn how to properly wait tables?