It's a huge cultural taboo to fire anyone without cause in Japan. And even if you do have cause, there's a pretty high bar for what actually constitutes cause. It would be a huge scandal if a Japanese company, especially a large salaryman-style company, fired an employee for anything less than stabbing a coworker.

Hell, even in the entertainment industry, where employment is gig-based, Masashi Tashiro didn't get blackballed until he was convicted twice for voyeurism, twice for drug abuse, once for nearly crippling a guy in a car accident he caused, and once for posessing an illegal weapon [0].

[0] https://en.wikipedia.org/wiki/Masashi_Tashiro#Second_trial_f...