The 78 year old former fighter failed to really make a mark in the boxing world, despite his 29 fight career, but following his boxing he became a central figure in Japanese legal history as he was put on death row for the murder of 4 people. His sentence was the longest of any death row inmate and saw Amnesty international campaign on his behalf.
Over the last few years we've seen Hakamada released ahead of a retrial, with real doubt on his conviction. In many ways he has been the Japanese Rubin Carter, though has received much less attention despite his longer struggle for justice.
The film, which is to be released next February, is a documentary that looks at Hakamada's battle for justice and his release. And is also thought to question Japans use of the death sentence, something that has been criticised by the international community.