One evening, after watching a film about invading aliens being defeated by humans, Squid Girl finds a new wave of enthusiasm for her own invasion. Determined to prove her formidable nature to everyone, the young invader decides to do everything in her power to get the fear and recognition she deserves. From putting her all into a jellyfish catching contest and facing off against a dog, to attempting to recruit a class of elementary school students to her cause, Squid Girl won't rest until humanity pays for polluting the sea... or at least until she gets her next fix of shrimp.