On the 30th of June, 1966, in a small country-side town in Japan, four members of the Hashimoto family are stabbed and burnt to death in their family home. The savagery of the crime shakes the country and shortly after, 30-year-old retired boxer Iwao Hakamada is arrested, convicted and sentenced to death. Despite a lack of evidence, Hakamada would remain on death row for almost half a century before being granted a retrial in 2014.