Singer-songwriter Motohiro Mata penned the theme song for the tribute movie "Satoshi no Seishun" starring Kenichi Matsuyama. The song is titled "Owari no nai Sora" (The Endless Sky). Hata wrote the song while getting inspiration from the determination of the late Satoshi Murayama in doing shogi despite his health condition back then. He is the character being portrayed by Matsuyama in the story. Murayama is a well-known young genius shogi master who died at a young age of 29 in 1998.
The singer wrote the song while he was in the middle of a concert tour within Japan last May. He also took the time to watch the unedited film footage as well as to read the novel while making the song. He included the lyrics "Humans are born to be sad and tortured but destiny is what makes them happy.", which he got from Murayama's notebook, making it a more personal song for the late shogi player.
This is the film where Matsuyama had to gain weight to play the role of 'Satoshi Murayama'. "Satoshi no Seishun" will be the closing film during the 29th Tokyo International Film Festival which will begin on October 25th. It will be shown in theaters starting November 19th.