A beautiful "special student undercover cop" attends a prestigious high school in order to bust up a student prostitution ring in this sexy spoof of the popular Yo-Yo Girl Cop series. Saki (Mihiro) may look like you're average innocent schoolgirl, but in reality she's a highly skilled agent for the Japanese government. Armed with a lethal yo-yo and a special pair of see through underwear, Saki befriends a student prostitute named Asuka in hopes of identifying of the ringleaders and gathering the evidence that will bring them to justice. Accomplishing that goal is no simple task, however, because in addition to being bullied about her unconventional undergarments, Saki soon finds herself falling for handsome young classmate Takuya. Now torn between love and duty, Saki is shocked to learn that Asuka has been murdered after her double life was discovered, and that the leaders of the prostitution are none other than the Headmaster of the school and a highly respected teacher.

岡田和人による人気コミック「すんドめ」の実写映画化第2弾。サディスティックな美少女・胡桃の精神的な奴隷になることに快感を見出すようになった英男は、彼女の気を引くために全裸事件まで起こしてしまう。英男が部長を務める“浪漫倶楽部”は廃部に追い込まれそうになるが、胡桃がアメフト部のマネージャーとして引き抜かれることでその危機を救い……。鈴木茜、二宮敦、次原かなら前作のキャストが引き続き出演する。

The high school boy and girl from Sundome 2 continue their sexless relationship in which she is sadistic and he is masochistic, but one day there is a rumour at school about her having a relationship with a different, and older, man. The boyfriend feels as if his girlfriend is hiding her relationship with the older man.

早华胡桃和相宇英男经过层层波折关系更加亲密。学校里关于早华胡桃的负面新闻却也随着越来越多，早华胡桃被女社长绘里打了一记耳光，还被绘里大骂。在浪漫俱乐部一次郊游活动中，早华胡桃和相宇英男的关系得到进一步的巩固，两人在山崖边护栏上相拥而吻。回到学校后，在一节课上，早华胡桃在黑板上做题目，突然晕倒，被紧急送入了医院，此后一直没有出现在学校，而学校却疯传她在外面卖春的负面消息。女社长绘里在放学路上阻挡住相宇英男给他看了早华胡桃一张用手机拍摄于宾馆的照片，并且说早华胡桃卖春给了他男友。相宇英男不相信，请求女社长绘里带他见见他男友，相宇英男见到绘里的男友之后，请求他不要传播早华胡桃的谣言，被却他狠狠打了一顿。

清楚な優等生のさやかは、内心ではエッチな妄想を膨らませる巨乳女子高生。スポーツ万能で人気のある伊藤に憧れていたさやかは、ある日、伊藤から試験勉強に誘われたことから果てしない妄想を抱き始め、同じくエッチに憧れる同級生らとサークル「処女組」を結成するが……。「すんドめ」シリーズの宇田川大吾監督が、佐能邦和による同名原作コミックを映画化。