Squid Girl

Shinryaku! Ika Musume (侵略!イカ娘, lit. "Invasion! Squid Girl") is a comedy manga series written by Masahiro Anbe, which began serialization in Weekly Shōnen Champion from 2007. It is published in Taiwan by Chingwin Publishing Group. An anime adaptation by Diomedea aired on TV Tokyo between October 4, 2010 and December 20, 2010, with a second series confirmed to be in production.

Story
A squid girl named Ika Musume vows to conquer humanity as revenge for its pollution of the ocean. Her first task is to make the Lemon beach house, owned by the Aizawa sisters, her base of operations. However, when she accidentally breaks a hole in their wall, she is forced to work as a waitress to pay off the damages.