Kenichi Matsuyama
There were several casting issues in the production of "Nana 2". Aoi Miyazaki had declined to reprise the role of Komatsu Nana. She was replaced with actress Yui Ichikawa. Ryuhei Matsuda had declined to play the role of Ren and was replaced with Nobuo Kyō. Also, Kenichi Matsuyama, who portrayed Shinichi Okazaki, had been replaced by Hongo Kanata.