Karina recounted that when she first received the offer, she was unsure how psychology theories would fit into a detective drama so she was excited and worried at the same time. As for Kato who knew about the original book, he was very intrigued and surprised by how the content was integrated into the script.
Karina and Shiina last worked together in the 2006 movie "Rinne" so this will be the first time in 10 years they are working together. Karina remarked that as she was around 21 or 22 years old and just starting out as an actress then, she remembered how kind Shiina was towards her. He then chipped in to say that she had matured a lot after all these years.
As for Karina and Kato, it is the first time that they are working together. With regard to his co-star, Kato said that there were times when she put on a really cold and expressionless face which made him feel as if he was being looked down on. However, Karina was quick to point out that this was because she had to play such a character. Kato then revealed that Karina had actually said that he is a troublesome person because he always cleans his bathroom mirror and tap after bathing. In response, Karina admitted readily to this and said that Kato is such a meticulous person that she finds it a hassle if he were to ask of her to do the same.
Sources: Nikkansports / Sponichi / Eiga.com