Tsumabuki and Mitsushima who worked together several times before, had developed such a deep mutual understanding of each other's acting style to the extent that Tsumabuki said that he didn't need to talk too much to her beforehand about how he was going to play his character. Meanwhile, Mitsushima who plays Tanaka's younger sister Mitsuko arrested for child neglect, revealed how she was feeling uneasy because she couldn't tell initially what kind of movie the director was trying to make so she didn't know how to play her character. However, her fears were put to rest when she emailed Tsumabuki and he replied with an assuring message that it will be an interesting movie in the end and even said "I love you" to her (in a brotherly manner). Upon seeing the message, Mitsushima replied with a "I love you" message too which shows how close the two actors are in real life. She also revealed that she was reprimanded once in the past by Tsumabuki when she showed up at a movie's meet-the-fans event looking grumpy which made him remark that she should behave more like an adult at such events.
"Guko Roku" will be screened in cinemas from 18 February.