Squid Girl (2010)

Squid Girl emerges from the ocean depths with a single goal: to dominate humanity and make them pay for polluting her home. But her grand invasion hits a snag when she accidentally wrecks the first beach house she tries to claim as her base. Forced to take a job at the Lemon Beach House café to cover the damages, she finds herself under the thumb of the Aizawa sisters, who won't let her forget her debt. Between their firm management and her own chaotic schemes, conquering the surface world is looking like a much taller order than she ever imagined.