I still remember the day of the explosion down the road from our office in Nagoya. The worker had been driven to such desperation and rage that he sealed himself off in the boss's office after dousing everything (including himself) in gasoline.
The cops were there, trying to talk him down, but the fumes had reached such a concentration that the next time the aircon kicked in, the place exploded.
The worker exploitation in Japan is BAD, and has been for decades. When you employ someone, you don't technically own them, but culturally you absolutely do.