--- "Students in 3rd grade 2nd class at a high school are supposed to study hard for their entrance exams. Instead, they must fight a war against bizarre alien creatures that appear in the sky." "To increase the military power in Korea, the government announces that all universities and high schools will organize into reserve force." And y/n Anderson who happens to be get here at the wrong time. (Let's continue the story with y/n and her new friends)