The other side, according to Ghosn, wasn't the Japanese legal system -- it was other Nissan executives that weaponized the Japanese legal system against a foreigner. Still, I agree it's very much a case of infighting among the privileged.
I'd add that the Japanese political system was involved as well. It wasn't hard for the Nissan power players to align political support since there was already national pride and home-team loyalty at stake. The deck was definitely heavily stacked against Ghosn.