this is mostly fantastical nonsense. I go home at 6pm everyday. go outside at 6pm and you will see businesspeople everywhere also on the commute home.
also it is nearly impossible to fire anyone in Japan for anything
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I see the same thing everyday.
Most people are more than likely getting off at regular hours and going home or out for dinner and drinks (whether you consider that work or not -- they arent being paid). Otherwise the bars and trains wouldnt be packed full of people at 6pm and happy hour wouldnt exist.