Deep Sea of Tree(2016)

Overview:

Sachiko lost her parents at an early age and lived together with her only sister Nobuko who worked for a newspaper. Out of the blue, she is told that Nobuko is killed in an accident, but she simply cannot believe it because her sister had told her she was going to an entirely different place. She begins her investigations on her sister’s mysterious death with the help of Nobuko’s colleague and journalist Ryoichi. And when another colleague, Tomoe commits suicide, Sachiko has a gut feeling that a well-known figure is involved in the death of her sister...