Yo-Yo Sexy Girl Cop (2006)

In a playful parody of the popular Yo-Yo Girl Cop series, a stunning "special student undercover cop" infiltrates a prestigious high school to dismantle a student prostitution operation. Saki (portrayed by Mihiro) may appear as a typical innocent schoolgirl, but she is, in fact, a proficient operative working for the Japanese government. Armed with a deadly yo-yo and a unique pair of transparent undergarments, Saki strikes up a bond with a student prostitute named Asuka with the aim of uncovering the masterminds behind the illicit activities and securing the evidence needed for justice. However, achieving this objective proves to be a challenging endeavor as Saki not only faces ridicule for her unusual choice of lingerie but also becomes romantically entangled with the attractive classmate Takuya. Caught between her feelings and her mission, Saki is shaken by the revelation that Asuka has been murdered following the exposure of her double life, and the shocking discovery that the key figures behind the prostitution ring are none other than the Headmaster and a respected teacher at the school.