It's 2015, and aliens have landed. Yuri Ootani is a whiny little fifth-grader who gets voted by her classmates to be the class' Anti-Alien Protection Officer to neutralize and capture aliens. Yes, that's right, aliens are invading, so let's recruit eleven-year-olds. Yuri isn't very happy about her new post, especially since it involves wearing a weird alien symbiont, named a Bougu, on her head.<br />