Based on Sukeban Deka. Asami, a 2nd-year student at Takanoha High School, picks up a red yo-yo that has fallen from the sky, causing a mysterious girl who only she can see to appear. She wants to be friends with a girl, but when Asami walks around her school, she witnesses her classmate Suzuki being harassed by a delinquent. Asami tries to help him, but Suzuki has a secret.. Asami uses her yo-yo as a weapon to defeat evil on campus.