The film stars Aya Matsuura in the lead role of Saki Asamiya and Rika Ishikawa as her rival, Reika Akiyama.

Although held in a straight jacket, she escapes by dislocating her own shoulder and tries to exit the facility, but a moment of kindness to comfort a little girl gets her captured again.

K is then informed by Japanese inspector Kazutoshi Kira that her mother will be deported to Japan for brutalizing a mugger and living illegally in New York, unless K accepts to work for them in the reactivated Sukeban Deka program.

After accepting, not without hesitating for her strained relationship with her mother, K is given a hi-tech steel yo-yo weapon and a new name, "Saki Asamiya," and is ordered to infiltrate an elite high school in Japan.

The school, Seisen Academy, is suspected to be the source of a website called "Enola Gay" that rallies juvenile suicide bombers across the country.

Saki looks into the chemistry club, which the former operative was investigating before her death, and is forced to struggle to save two suicide bombers, Amaki and Higashiyama, who try to use Tae as a human shield.

It's then revealed that Reika is a former operative of Tokumei Keiji, a police program similar to Sukeban Deka, and that she has her own armed yo-yo, which sports blades.

Saki then confronts Romeo and his gang, who have seized Tae, Amaki and Higashiyama as bomb-strapped hostages, and manages to take the villains out thanks to a bulletproof uniform.