Ryuhei Kitamura
Apart from being Kobayashi's directorial debut, he is also in charge of the music production. The project was originally taken by Ryuhei Kitamura, then dropped in 2006. When filming finally started in late 2008, Kobayashi hand-picked a completely different cast for the movie, casting pop singer and actor Jin Akanishi with actress Kie Kitano for the lead roles.