Twenty years after the events of the original Sukeban Deka, a Japanese girl by the name of "K" is captured in New York and put on custody after beating 11 policemen. Although held in a straight jacket and a cage, she escapes by dislocating her own shoulder and tries to exit the facility, but a moment of kindness to comfort a lost little girl gets her captured again. K is then informed by Japanese inspector Kazutoshi Kira that her mother will be deported to Japan for both brutally beating down a mugger and living in New York with an expired visa, unless K accepts to work for them in the reactivated Sukeban Deka program. After accepting, not without hesitating for being in bad terms 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, named the Seisen Academy, is suspected to be the source of a website called "Enola Gay", which is rallying juvenile suicide bombers across the country. She is also briefed that another Sukeban operative was sent earlier only for her to commit suicide like the juvenile terrorists, and that a counter for 72 hours has just appeared on the website. Upon arriving the school, Saki learns that the entire school is dominated by a girl named Reika Akiyama and her henchwomen, and she immediately saves a bullied student named Taie "Tae" Konno from them. 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. Asamiya captures Higashiyama, while Amaki is saved from her bomb by the school janitor Jirou Kimura, who had become friends with Saki earlier. Kira interrogates Higashiyama and informs Saki that the Enola Gay website is run by a user named Romeo, but Higashiyama is abducted by a gang of thugs, despite Asamiya's efforts to fight them off. Afterwards, Tae tells Saki that she and a fellow bullied schoolgirl named Kotomi Kanda used to run together an anti-bullying website until Kanda snapped and tried to commit suicide by bombing, being left catatonic in a hospital and leaving their site to be replaced by the Enola Gay website. Moreover, Reika interrupts them and reveals that Kotomi fell in love with a man who advised her to blow herself up. Going tothe hospital, Saki and Tae visit Kotomi, who only says the name of Jirou Kimura. Now revealed to be Romeo, Kimura kidnaps Saki and ties her to a bomb, which she is left to escape from. Meanwhile, Reika discovers herself as Romeo's lover and hosts an assembly on the school in front of all the students and teachers in order to celebrate his ideology. At the same time, Romeo and his gang are capitalizing on the event to rob a bank in Tokyo. Tae is brought to the room and strapped to another bomb, but after some dramatic exchanges she is saved by the returning Saki. The girl chases Reika, who still has Tae as her hostage and attempts to reunite with Romeo, and ends up facing her in a singles duel. 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. They have a duel, and although the less experienced Asamiya is initially overpowered when trying to user her weapon, she defeats Reika by burying her under metal pipes. 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. Eventually Romeo, who wears a bomb strap as well, disables her yo-yo by slicing the string with his katana, but she still knocks him out. Saki takes the artifacts off the hostages but leaves Romeo's to explode, killing him. Later, Saki calls her mom, who is implied to be the first ever Saki Asamiya from the 1985TV series. Kira then informs he has got another job for her, and she bids farewell to Tae and Kotomi before leaving the school.
Cast
Aya Matsuura as Saki Asamiya
v-u-den
*Rika Ishikawa as Reika Akiyama
*Erika Miyoshi as Kotomi Kanda
*Yui Okada as Tae Konno
Yuki Saito as Saki's Mother
Hiroyuki Nagato as Dark Inspector
Shunsuke Kubozuka as Jiro Kimura
Riki Takeuchi as Kazutoshi Kira
Masai Ōtani, another Hello! Project member makes a cameo appearance in the film.
Tak Sakaguchi as a member of the Enola Gay gang
Music
The movie's theme song, "Thanks!" is by the Hello! Project group GAM, consisting of Aya Matsuura and Miki Fujimoto. The song "Shinkirō Romance", also by GAM, was used an insert song.
UK release
Yo-Yo Girl Cop was licensed for UK release by 4Digital Asia, a sublabel of 4Digital Media, formerly ILC Entertainment. The new sub-label was launched in 2008 to fill the gap in the UK for "Asia Extreme" titles created by the demise of label Tartan. It was released on DVD on September 22.
Miscellaneous
The film is parodied in the softcoreV-Cinema release Yo-yo Sexy Girl Cop, directed by Daigo Udagawa and starring AV idolMihiro. In addition to its similar name, the cover artwork is a near-reproduction of Yo-yo Girl Cop's original poster. The DVD was released in Japan in November 2006 and in the United States with English subtitles by Cinema Epoch in November 2008.