It’s been 25 years since Earth was invaded by beings from another realm. Now, everyone’s life is shaped by a single measure of strength—the World Ranking.

From the countryside of Gunma comes Kinoko Kino, a high school girl with zero communication skills, trembling her way through city life with just one dream: make a friend.

…But little does she know— She’s actually the World Ranking’s #1: UNKNOWN!