A juvenile delinquent code-named Saki Asamiya is taken in by the government and forced to fight crime to redeem her actions. She is sent to various high schools to infiltrate and neutralize gangs and other forms of crime as a police officer using her metal yo-yo badge as a weapon.

• Yuki Saito
• Kôji Naka
• Hiroyuki Nagato
• Sei Hiraizumi
• Hitomi Takahashi