He was held in solitary confinement for 108 days for a white collar non-violent first offence. Nobody should be subject to such conditions, for any offence. It is state sponsored torture. The Japanese justice system is dysfunctional, and it has prevented the case from being investigated fairly and appropriately.

No justice system that's actually fair can have a 99.8% conviction rate at trial. It's a process designed to achieve convictions and punishment, not actually discover the truth.