Drama W Series "Pareto's Miscalculation: The Case Worker Murder Case" DVD. Main feature: 255 minutes, Bonus footage This is a rental return, so there may be minor scratches on the disc, but there were no issues with viewing. A human mystery drama series based on the novel by Yuko Yuzuki, starring Ai Hashimoto. A contract employee in the social welfare department gets involved in a case where a case worker is murdered, and learns about the victim's true face and the reality of fraudulent benefit claims... Co-starring Takahisa Masuda and others. Cast: Ai Hashimoto, Takahisa Masuda, Yuya Kitamura, Marika Matsumoto, Toshinori Omi, Masato Wada, Mami Tomite, Yuto Nasu, Mebuki Yoshida, Mantaro Koichi, Naomi Nishida