Assume a US citizen works for a US company remotely and that this person has a passport, but no visa. Let's say they want to go spend some time in Japan for leisure/tourism/sightseeing - no more than 90 days, but still long enough to require them to take their work laptop and do their US-based job while they're there.
Is this allowed? My understanding is yes, even if their passport is stamped for tourism and sightseeing, as long as it's not for a Japanese entity, and as long as they're back out within 90 days. However I had somebody reading some of the same material I was a little while back and understanding it differently. What's the truth in this case?
Unless I'm mistaken, this seems to suggest that work can be done for 90 days, without a visa, but it is not clear about trying to do it while you're acting like a tourist:
A visa is NOT necessary for US passport holders visiting Japan for a short-term stay of less than 90 days with the purpose of tourism and business.