In the depths of the ocean, a young squid girl named Ika Musume has had enough of humanity's pollution and decides to take matters into her own tentacles. She surfaces with a plan to conquer the world and punish the humans for their wrongdoings. However, her invasion doesn't quite go as planned, and she finds herself working at a beachside restaurant to pay for the damages she caused. Despite the setbacks, Ika remains determined to achieve her goal, but the Aizawa sisters who run the restaurant have other ideas. Will Ika be able to conquer the world, or will she succumb to the challenges of the human world?

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Some TV shows that have similar genres and were produced around the same time as Squid Girl include Rick and Morty, The Testament of Sister New Devil, The Amazing World of Gumball, LEGO Monkie Kid, Gravity Falls, Full Metal Panic! The Second Raid.