After the events of
Sukeban Deka III, the 17-year-old Saki Asamiya III, Yui Kazama, works for the Juvenile Security Bureau, an expansion of the Sukeban Deka project. This organization is led by politician Kuraudo Sekine, who fights
juvenile crime in drastic manners that include
summary executions, as reflected by his student agents's triple-bladed yo-yo weapons. However, when Sekine's methods become too zealous, Yui refuses to undertake undercover missions for them and quits the bureau. Yui tries to resume her normal life along with her older sisters Yuka and Yuma, but she eventually returns to action after learning Sekine and his agents are staging terrorist attacks and blaming them on a gang called the Outcast League. After they discover that Sekine's actual goal is to
overthrow the Japanese government, the Kazama sisters are forced to team up with the outcasts and their disenchanted leader Kei to stop Sekine. ==Cast==