Perfect Education 4: Secret Basement (2002) is the fourth installment in the taboo-breaking Perfect Education series. Takeru is just your average shy, mild-mannered nerd. He discovers Lily (Haruko Katou), a high-school-aged prostitute, passed out in a Tokyo park. He doesn’t hurt her--he just decides to lock her up in a basement. Against all odds, she falls in love with him and they get it on in his “secret basement” in several topless scenes.