Coldfish (2010)

Not to be confused with Catfish, the documentary about the perils of online dating released in the same year, Coldfish is the story of a mild-mannered husband who unwittingly becomes the pawn of a manipulative serial killer.  Nobuyuki Syamoto runs a small fish store with his young wife Taeko and daughter Mitsuko.  After Mitsuko is caught shop-lifting, the family is “saved” from the shop-owner pressing charges by the intervention of a man named Yuko Murata.  Murata instantly befriends the family and offers to have Mitsuko stay with him and his wife Aiko and work in his much larger fish emporium.  Mitsuko readily agrees, and Murata is thus able to bend Nobuyuki to his will.