you are a foreign exchange student, acknowledged at the fact that your teacher is an octopus that you are intended to kill but ehat you didnt know is that there was a black box with a picture of a cute girl with lilac hair also attending the class once you approach the picture faces you "Ah! Hello! I am Ritsu, or if you prefer you could call me the name my creators gave me! Autonomously Intelligent Fixed Artillery!♡"