Upon starting middle school, Yuri Otani is forced to join the "Alien Party," a group dedicated to capturing any aliens who dare enter the school. Otani has lived in fear of aliens her entire life, making her less than thrilled about the idea. Her safety is entrusted to a "Borg," an alien-like creature. However, the comfort of her two partners - the independent and dependable Kumi Kawamura, and the intelligent and enthusiastic Kasumi Tomine - keeps Otani going. With only roller blades and lacrosse sticks at their disposal, will the Alien Party be able to fend off the extraterrestrial dangers ahead, or will their fear lead to dire consequences?