Yokujô mofuku tsuma: Uzuku (2005)

Mikami is a dignified pharmaceutical company president, but he harbors a secret: he enjoys engaging in "baby play" with his wife, Etsuko. Numakura, who has been entrusted with the top-secret task of developing a new drug at the president's home, spies on these intimate moments; he is secretly in love with Etsuko. Meanwhile, Numakura’s assistant, Ami, harbors feelings for him. One day, Numakura discovers that Etsuko is plotting to kill her husband. Aware that he had been spying on the bedroom all along, Etsuko seduces Numakura and draws him into the scheme, but...