I saw a rant about overtime or staying late if your boss is still at the office.

It's the same in a(lmost all i think) Japanese Company.

9:00-18:00 work schedule.

Come in earlier than your boss before actual work schedule.

Go home after your boss after the actual work schedule.

There's no more work to be done and they think you going home early weren't doing enough work and shit.

Good think i left that company.