Shinryaku! Ikamusume

Shinryaku! Ikamusume is a Japanese manga series written and illustrated by Kazuya Minekura. It follows the story of a young woman named Tsubasa who discovers that her family is descended from a long line of squid-like humanoids known as the Ikamusume. When a group of Ikamusume attack her hometown, Tsubasa is forced to join them in their fight against a mysterious enemy. The series is known for its humor, action, and ecchi elements.