After the events of the previous film, the 17 years-old Sukeban Deka III, Yui Kazama, works for the Juvenile Security Bureau along with her older sisters Yuka and Yuma. This organization is led by politician Kuraudo Sekin, who fights juvenile crime in heavy-handed manners, to the extent to equip his student agents with triple-bladed yo-yo weapons. However, when Sekin's methods become too zealous, Yui quits the bureau and refuses to undertake undercover missions for them. It is soon discovered that Sekin's actual goal is to overthrow the Japanese government, and the Kazama sisters, along with a gang of young outcasts, have to stop him.

A young woman, Asami, searches for the man who helps her quest to enter medical school.

The mysterious deaths of men linked to a charming singer unleash the resentment of her suitors.

In the desert of Egypt, Kurata, the CEO of the Japanese corporation Tokokaihatsu, is killed by a sniper. After the news reaches Japan, the CEO's lawyer, Yamamoto, receives a visit from two men that attempt to steal the deceased CEO's will. This is witnessed by two detectives, Tsuzuki and Ōnuki, but they fail to catch the perps. Yamamoto hands the detectives a set of keys before he stops breathing. Tsuzuki and Ōnuki now have to investigate Kurata's murder...

Nayuta is a normal school girl, until she meets a young boy named Kiro trying to help his sick mother. Nayuta takes them to the hospital, but inside Kiro's mother vanishes without explanation and Kiro runs away. Later that night Kiro shows up at Nayuta's house and shows her his psychic powers, enabled by a mysterious tiara he wears.