Generally, leaving work early in Japan is (was?) seen as lazy and a sign of a morally dubious person. Keep in mind that, traditionally, people in Japan are expected to work 12-16 hour days with no complaints and, for businesspeople, sleep at the office if there is a lot of work to be done.

The fact that people are eager to leave early and don’t think of it as inherently shameful signifies a huge shift in culture.