Sukeban Deka - S01

After serving time in a juvenile detention center, troubled teen Saki Asamiya gets an opportunity to turn her life around-and potentially save her mother from execution-by going undercover as a cop. Equipped only with a unique yo-yo, Saki is sent back to her old high school to uncover the truth behind student corruption and unexplained deaths. To solve the school’s dark secrets, she must face the wealthy and influential Mizuchi sisters, who seized control of the school after her expulsion.